Year	current US$
1970	360063.912752713
1971	363612.5026518
1972	361412.31508588
1973	486008.264636547
1974	560122.241140222
1975	734070.375622347
1976	678721.537809955
1977	1137373.1386038
1978	1200001.05532008
1979	1168122.20459471
1980	1596109.8544518
1981	1359745.94655317
1982	1576534.23039588
1983	1234503.4590178
1984	1160622.78354495
1985	882131.060651402
1986	1420432.44467155
1987	1475274.62543938
1988	1657898.63002035
1989	1710381.41169699
1990	2199208.93399426
1991	2161170.26874724
1992	2233361.35821109
1993	1956115.54699221
1994	2257427.48002355
1995	3254514.86756624
1996	3209014.53452825
1997	3012910.15586261
1998	3334281.70030081
1999	2317624.10409963
2000	2320892.7156873
2001	2262220.34229216
2002	2729181.4120356
2003	4089864.17661736
2004	3504497.88286188
2005	3745876.54288737
2006	3833326.02836028
2007	5401285.42992595
2008	6615232.07172523
2009	6590976.91406951
2010	7815785.03328066
2011	8848027.38699675
2012	9569500.74747477
2013	10035581.2887235
2014	10559532.265194
2015	10786942.4105977
2016	11316065.8957328
2017	11840851.5519501
2018	9634117.62397283
2019	8747890.27177346
2020	9357405.24547638
2021	9924242.75493671