Year	current US$
1994	74.44534977375523
1995	51.374396790306086
1996	59.12056892146141
1997	67.47472073109981
1998	66.63467239087018
1999	51.40716976388456
2000	305.1894238243921
2001	94.9041156509142
2002	111.84325815971856
2003	96.9054336675966
2004	120.73488751178637
2005	138.7649547910599
2006	172.1888920597935
2007	182.4835681565897
2008	194.4097473453601
2009	182.82427806735782
2010	219.7620967228486
2011	246.14176009117656
2012	271.18269165192135
2013	296.71329243911595
2014	301.5530536197892
2015	324.0933381731322
2016	330.2537565352789
2017	324.6904177623726
2018	411.99932436838964
2019	460.5027752636467
2020	410.4973517987626
2021	338.93629279950414