Year	current US$
1977	6129999.91327524
1979	0
1980	12810000.0787526
1981	10289999.9581277
1982	8689999.99202788
1983	8819999.89040196
1984	7800000.08270144
1985	8660000.01505017
1986	6669999.9384582
1987	6069999.84383583
1988	8199999.99925494
1989	13780000.3048033
1990	9110000.06832182
1991	8640000.02853572
1992	7080000.07085502
1993	10060000.037774399
1994	16799999.9392778
1995	24080000.0932068
1996	21939999.7852743
1997	17750000.0596046
1998	19089999.902993403
1999	14719999.9187142
2000	10960000.0567734
2001	18530000.247061297
2002	17330000.048503302
2003	16919999.9067932
2004	15870000.0941753
2005	12679999.917745601
2006	16260000.0053644
2007	14760000.0798702
2008	16400000.0953674
2009	21679999.977350198
2010	19980000.1084805
2011	20889999.7472763
2012	23500002.0861626
2013	24497522.175312
2014	24799820.7807541
2015	22089200.9735107
2016	17364684.373140298
2017	14629961.4310265
2018	17012259.9005699
2019	28227501.6307831
2020	29853860.0206375
2021	32774551.2127876
2022	29297589.600086212