Even Norway isn't immune to the falling price of oil. For years, the wealthy Scandinavian nation had fueled its rapid growth with the oil it pumped out of the North Sea. But what once transformed a poor agrarian state into one of the richest countries in the world now has policymakers wondering if it wouldn't be wiser to allocate more resources to Norway's fishing industry.

For Russia, the falling price of oil has added insult to injury as its economy is already reeling under Western sanctions. In 2015, economic output in the country shrunk by around 4 percent. As a result, salaries have dropped and the ruble has lost half of its value against the dollar. The news service Bloomberg estimates that 2016 will be another recessionary year for Russia.

Nigeria is Africa's largest producer of oil. Before being elected president, Muhammadu Buhari announced that he would increase government spending - but the drop in the price of oil may make that promise impossible to fulfill. The World Bank estimates that three-quarters of the Nigerian state's revenues come from the oil business. Many infrastructure projects are currently on hold.

Nigeria's not the only country that calculates its budget based on the price of oil staying high. The result has been a big gap between expected and actual revenues. The price for a barrel of oil has dropped by nearly 75 percent since mid-2014. Many experts currently have little reason to believe the per-barrel price will return to its old level of $120 (110.76 euros) anytime soon.

Now that sanctions against Iranian exporters have been lifted, the Islamic Republic plans to ramp up its oil production by half a million barrels a day - putting further pressure on an already oversupplied energy market. Iran, for its part, blames its archrival Saudi Arabia for falling oil prices.

Saudi Arabia has refused to curb oil output in order to protect its market share from competition from the US fracking industry and Iran. But now, even the world's largest oil exporter is starting to get a taste of its own medicine. The International Monetary Fund is warning about a massive impending budget deficit. The Saudis want to introduce taxes and slash energy and food subsidies.

Like their Saudi counterparts, other oil-rich Gulf statessuch as Qatar, Oman and the United Arab Emirates are also watching their energy reserves dwindle. These regional powers all boast large sovereign wealth funds - but altogether, the six Gulf states have already accumulated a budget deficit worth $260 billion (239.8 billion euros), according to estimates by JP Morgan Chase.

Venezuela has the largest oil reserves in the world. For years, the country's socialist government used revenues from the sale of oil to fund its lavish social programs. Now, President Nicolas Maduro has declared a state of emergency for the Venezuelan economy. Popular support for the successor to Hugo Chavez has been slipping for about a year - about as quickly as the price of oil has dropped.

Thanks to a boost in shale gas extraction, aka fracking, the US is now the world's largest energy producer. Low oil prices, however, have made fracking widely unprofitable. The US is also one of the largest consumers of energy in the world. While motorists may celebrate having to spend less money at the pump, bigger, gas-guzzling vehicles are gaining in popularity - bad news for the environment.

Girls have not always been able to go to school like these students in Riyadh. Enrollment at the first school for girls, Dar Al Hanan, began in 1955. The Riyadh College of Education, the first higher education institution for women, opened in 1970.

At the start of the 21st century, women could get personal ID cards for the first time. The cards are the only way for them to prove who they are, for example in disputes relating to inheritance or property issues. IDs were only issued with the permission of a woman's guardian, though, and to the guardian instead of directly to the woman. Only in 2006 were women able to get IDs without permission.

Saudi Arabia banned forced marriage in 2005, but marriage contracts continue to be hammered out between the husband-to-be and the father of the bride, not the bride herself.

In 2009, King Abdullah appointed the first female minister to Saudi Arabia's government. Noura al-Fayez became the deputy education minister for women's affairs.

Saudi Arabia agreed to allow female athletes to compete on the national team for the Olympics for the first time. One of them was Sarah Attar, who ran the women's 800 meter race at the 2012 Olympics in London wearing a headscarf. Before the Games, there was speculation that the Saudi Arabian team might be banned for gender discrimination if they didn't allow women to participate.

Saudi leaders allowed women to ride bicycles and motorbikes for the first time in 2013 — but only in recreational areas, wearing full Islamic body covering and with a male relative present.

In February 2013, King Abdullah swore in the first 30 women to the Shura, Saudi Arabia's consultative council. This allowed women to be appointed to these positions, soon they would be allowed to actually run for office...

In Saudi Arabia's 2015 municipal elections, women were able to vote and run for office for the first time. By contrast, New Zealand was the first country to give women the vote, in 1893. Germany did so in 1919. At the 2015 Saudi polls, 20 women were elected to municipal roles in the absolute monarchy.

In February 2017, the Saudi stock exchange names the first female chairperson in its history, Sarah Al Suhaimi.

On October 29, 2017, the country's General Sports Authority announced that women would be allowed into sports stadiums for the first time. Three previously male-only arenas will soon be open for women as well, starting in early 2018.

On September 26, 2017, Saudi Arabia announced that women would soon be allowed to drive, causing a flurry of driving courses for women to prepare for June 2018, when they would no longer need permission from their male guardian to get a driver's license or need their guardian in the car when they drive.

The new law, designed to protect them from having their marriage ended without their knowledge, will allow women to check their marital status online or visit a court to get a copy of divorce papers. Human rights defenders say the law does nothing to address the fact that Saudi women can only obtain divorces in exceedingly limited cases — such as with her husband’s consent or if he has harmed her.