Year	current US$
1987	1171.612028339607
1988	1275.4041112909567
1989	1424.5380861834376
1990	1690.1330915795545
1991	1608.549603702638
1992	1544.362394743512
1993	1625.7504001708292
1994	1291.7922818265724
1995	1444.1345176033333
1996	1523.5045541616585
1997	1609.744521144341
1998	1953.9910202302526
1999	1777.7117959112209
2000	1806.7140204098657
2001	1541.9308789257727
2002	1786.103603021029
2003	2267.1000030018304
2004	2906.977413451635
2005	3602.2338462434163
2006	4167.687129226856
2007	5222.838423749934
2008	6206.9649505953375
2009	5133.423164112136
2010	6022.6300983727115
2011	6785.422424486458
2012	7100.359509632033
2013	7678.785030807879
2014	7307.046190629483
2015	6312.150341670412
2016	6006.367089073089
2017	6111.394337178256
2018	5957.82642405214
2019	6022.632386068539
2020	5738.25499247106
2021	6620.203795635164
2022	7302.238611261121
2023	8479.056831081647