Year	constant 2015 US$
1987	1414925462.484994
1988	1563077168.8894467
1989	1576640044.5753696
1990	2220834708.928065
1991	2035299201.362157
1992	1848706361.2486205
1993	1567307076.5715716
1994	1307430409.2915545
1995	1247271545.0338778
1996	1236023344.5654047
1997	1233767527.5778484
1998	1281397935.0804863
1999	1321616319.3753188
2000	1391236200.4125173
2001	1441353369.5027926
2002	1501967426.8287497
2003	1613555122.568923
2004	1802090782.271938
2005	1953177716.4497964
2006	2136642952.130658
2007	2403043032.10134
2008	2663244400.62026
2009	2728206051.0801935
2010	2695501182.4390745
2011	2890424224.064773
2012	3071700610.072716
2013	3219208889.8613043
2014	3363478207.248925
2015	3482658370.4026556
2016	3593723617.960546
2017	3712589115.679048
2018	3819417360.606281
2019	3946939244.4417386
2020	3635432407.2396073
2021	3887589962.1948624
2022	4153065475.9144597
2023	4408594552.458828