In the time period between January 1986 and October 2015, the price of crude oil fell as low as $11 a barrel and rose as high as $140 a barrel. The price of oil stayed relatively steady in the late 1980s and 1990s, while the 2000s saw much more volatility.
In the spring of 1986 and late 1998, the price of crude oil dipped below $11 at some points. Between 1986 and 2000, crude oil was most expensive in the fall of 1990, when it reached $40. The price of oil steadily increased during the 2000s until reaching a peak of $140 in the summer of 2008. The price then precipitously fell until reaching a low of approximately $40 in the winter of 2008. Oil's value rebounded in the 2010s until another drop in late 2014. The price of oil in September and October 2015 varied between $40 and $50 a barrel.