Year	constant 2015 US$
1991	4868.335420201039
1992	4788.847224031126
1993	4671.525669081878
1994	4611.615594563738
1995	4582.018168944733
1996	4523.6215985170065
1997	4521.089552388509
1998	4510.901200765049
1999	4498.8093185688795
2000	4399.631393701964
2001	4417.212136969845
2002	4601.354240067173
2003	4530.380153523068
2004	4984.180280972055
2005	5192.2081492403595
2006	5347.782451009706
2007	5597.782648737261
2008	6024.317709716973
2009	6267.612185371005
2010	6622.587736159995
2011	6655.016390716802
2012	6795.67790977607
2013	7090.4459348262335
2014	7262.482564941186
2015	7220.684162239264
2016	7118.756513333467
2017	7012.996969638491
2018	6958.4540734061575
2019	7011.386417069142
2020	6892.386900248154
2021	7041.488462119588
2022	7078.176464829169