Year	current US$
1977	6109999.913722277
1980	10090000.011026854
1981	7480000.004172329
1982	6810000.03218651
1983	7149999.948218465
1984	6110000.0329315625
1985	6789999.999105935
1986	4779999.9471753845
1987	5999999.845400451
1988	8120000.001043079
1989	9630000.226199621
1990	8860000.066459183
1991	8490000.030025845
1992	6990000.067278758
1993	9890000.03039836
1994	16079999.9628216
1995	21610000.008717187
1996	19239999.73759056
1997	14340000.117197644
1998	15149999.827146526
1999	12639999.985694882
2000	9170000.0166893
2001	17270000.2193451
2002	15050000.071525585
2003	13059999.883174898
2004	14620000.09417534
2005	11469999.96900559
2006	14699999.958276754
2007	11920000.19550323
2008	14280000.060796749
2009	15899999.856948847
2010	15120000.079274168
2011	15999999.880790703
2012	17286820.1136589
2013	17655514.061450977
2014	17511082.76844026
2015	15964636.445045462
2016	11928705.841302864
2017	10555059.373378765
2018	12608949.959278105
2019	20269742.965698246
2020	21640089.8694992
2021	23979046.16594315
2022	26554969.608783722