2016 – 2017 – 2018 – 2019 Assassinations and attempts Prominent assassinations, targeted killings, and assassination attempts include: Disasters Non-natural disasters Aviation General Fires Marine Pollution Natural disasters Earthquakes and tsunamis Tropical cyclones Tornadoes Floods, avalanches, and mudslides Volcanic eruptions Droughts, heat waves, and wildfires Economics The global economy during the 2010s was generally strong. It saw steady growth, low unemployment, and increasing consumer confidence. The decade ended with a strong finish, with 2019 seeing record highs in many areas. A sovereign-debt crisis in Europe began in early 2010, and the Greek government admitted that it was having difficulties servicing its large sovereign debt. In the summer and fall of 2011, bond yields for Italy and Spain spiked above 6 percent. By 2015 bond rates had returned to normal ranges across Europe, save for Greece, which accepted another, even more stringent bailout package. The size of the European Financial Stability Facility was increased from €440 billion to €2 trillion. Despite the Eurozone debt crisis, the American Dow Jones Industrial Average had its longest stretch of gains since the late 1990s tech boom. However, economic issues, including inflation and an increase in commodity prices, sparked unrest in many lower-income countries. In some countries, particularly those in the Arab world, political unrest evolved into socioeconomic crises, resulting in the Arab Spring. As a result of the global recession, many central banks instituted a zero interest-rate policy, or close to it. Another form of monetary stimulus was that of quantitative easing. The resulting flood of market liquidity caused a rise in asset prices. As a result, for example, United States stock prices reached record highs. Another consequence has been the rise in housing prices in many major world cities. Some of the cities which recorded the most dramatic rises included Sydney, San Francisco, Vancouver, and Auckland. In 2010, China became the second largest global economy, surpassing Japan. Japan also saw a rating downgrade the following year due to debt burden. In August 2011, the S&P downgraded the United States' credit rating from triple AAA to AA-plus following a debt ceiling crisis. Also in 2011, a Gallup poll found that more than half of Americans believed the country was still in a recession. In June 2015, the Shanghai Stock Exchange lost a third of the value of A-shares within one month, an event known as the 2015–16 Chinese stock market turbulence. India became the