Year	current US$
1980	74.29551043700062
1981	133.275964381249
1982	128.41047134091053
1983	141.34277290455344
1984	115.93973454151273
1985	141.7038260058972
1986	99.04326101129816
1987	134.4991088657013
1988	118.50941454918988
1989	161.0031482790786
1990	181.37192618382704
1991	183.40077731391472
1992	149.02951653803876
1993	160.18777894171058
1994	150.04193871196577
1995	139.0301486981934
1996	150.39044191383337
1997	154.30601157642914
1998	97.15039118389015
1999	129.00381022287428
2000	240.31439087861304
2001	249.43792563361114
2002	260.377071013932
2003	270.94434209695794
2004	311.2150746687023
2005	337.72467988193847
2006	335.5645527355814
2007	369.6825638766452
2008	445.45120269086976
2009	409.01004182489345
2010	425.851151137608
2011	557.6107154847662
2012	462.7989437141858
2013	462.3526084353943
2014	477.9573044490954
2015	454.01910534186123
2016	508.4121002295329
2017	573.5025248279628
2018	641.8009933241088
2019	639.79119602037
2020	610.8568727236997
2021	677.4184155206988