Year	current US$
1977	11321703.703703703
1978	14759706.296296295
1979	12415413.703703703
1980	15624089.629629629
1981	17140217.407407407
1982	17566008.51851852
1983	18511399.629629627
1984	19943293.333333332
1985	21961909.629629627
1986	27191172.59259259
1987	30004988.518518515
1988	32290052.962962963
1989	28679312.962962963
1990	32918518.518518515
1991	34462962.96296296
1992	34692592.59259259
1993	34766666.666666664
1994	38085185.18518518
1995	33399999.999999996
1996	37914814.81481481
1997	38007407.4074074
1998	38900000
1999	40266666.666666664
2000	39696296.29629629
2001	38425925.925925925
2002	36118518.518518515
2003	37896296.29629629
2004	41118518.518518515
2005	41844444.44444444
2006	40981481.48148148
2007	44018518.518518515
2008	52988888.88888889
2009	61388888.88888889
2010	56622222.22222222
2011	62633333.33333333
2012	58414814.81481481
2013	69685185.18518518
2014	69992592.59259258
2015	76003703.7037037
2016	93762962.96296296
2017	69914814.8148148
2018	61155555.55555555
2019	73281481.48148148
2020	76418518.51851851
2021	94162962.96296296
2022	96088888.88888888
2023	96766666.66666664