Year	current US$
1977	7860000.038519504
1980	28430000.182241213
1981	27700000.572949667
1982	21409999.70026315
1983	20399999.67254697
1984	15890000.157058233
1985	27780000.286176756
1986	22139999.70443546
1987	22010000.191628933
1988	27190000.219270546
1989	33440000.243484966
1990	20739999.93875622
1991	27340000.350028276
1992	24809999.696910374
1993	25409999.72634015
1994	34319999.39866364
1995	33650000.121444464
1996	26719999.898225076
1997	22900000.24810435
1998	25579999.955371015
1999	23380000.388249747
2000	17989999.825134873
2001	24120000.228285804
2002	23830000.018700957
2003	23369999.9526143
2004	24539999.7085333
2005	26390000.099316243
2006	27240000.16786158
2007	27939999.55616893
2008	31469999.99880791
2009	28119999.866932638
2010	29440000.006929033
2011	28660000.251606107
2012	29854156.943503767
2013	29518053.079722464
2014	28772454.8727274
2015	25017925.105988983
2016	18359621.06287479
2017	16182802.647352215
2018	17467319.89830732
2019	25595959.313213825
2020	29880489.84110356
2021	29960142.284631737
2022	32867910.05730629