Year	constant 2015 US$
1977	52536156.77502746
1978	58911755.44343273
1979	58891275.81278327
1980	47397642.44053651
1981	48988195.14440783
1982	51730132.78475936
1983	56659770.603998005
1984	67940712.94203183
1985	74573062.94625495
1986	101257903.26792523
1987	77501921.56654328
1988	122410178.12743671
1989	109911857.21523525
1990	119279341.54197757
1991	94510828.75625534
1992	122532337.95787732
1993	120334214.0038244
1994	94053090.09045662
1995	102168239.06586924
1996	101559377.3004055
1997	79701049.94778742
1998	78659288.4169413
1999	67096899.00592648
2000	69787099.14968063
2001	53273172.30155824
2002	60411910.27570962
2003	51765978.21988961
2004	54155736.902776085
2005	41493216.919592604
2006	45474659.94005723
2007	46720261.93091664
2008	57181618.40053163
2009	55472056.14549006
2010	33995573.457016155
2011	32874735.885647643
2012	39941711.75936098
2013	42012411.679346874
2014	37714284.55185321
2015	38911111.11111111
2016	39509524.39074007
2017	37809270.78671495
2018	43047761.63933982
2019	45417668.1991402
2020	39390791.5971629
2021	42967023.33970735
2022	44923739.77785916
2023	29502724.548055936