Year	current US$
1980	262.16178013183077
1981	263.1657132806979
1982	296.8985572890037
1983	223.5081886246617
1984	247.73506020115175
1985	192.00186577369666
1986	87.82105611260795
1987	138.79843117297375
1988	208.04838917529273
1989	176.66804106735586
1990	102.5143246455155
1991	132.4614802006839
1992	109.52565188974319
1993	141.23830186578127
1994	152.88346118923846
1995	146.10612550913717
1996	165.45524512196062
1997	147.29416881085
1998	102.27078619982382
1999	115.73109062125428
2000	106.98098195473997
2001	187.83678178544753
2002	204.0206036516921
2003	206.27701697445124
2004	212.16895985027818
2005	239.31831995501935
2006	273.081858312585
2007	322.4512097104003
2008	378.1013005195046
2009	362.4160101105012
2010	347.65994849216787
2011	375.2007530625742
2012	504.3628323837508
2013	622.5324487981337
2014	601.6600829515532
2015	488.23930769895935
2016	357.90523369491746
2017	396.50327110175823
2018	420.3086056839222
2019	440.94320577195384
2020	420.628562689207
2021	409.68537744249517