Year	constant 2015 US$
1991	4460.261663651246
1992	4471.11223054016
1993	4346.478256400835
1994	4347.884985954277
1995	4317.893874391065
1996	4225.273939948081
1997	4201.443663553075
1998	4275.000847664248
1999	4259.358688264115
2000	4236.2158574254545
2001	4238.445348103839
2002	4184.6546143889655
2003	4179.720270522978
2004	4367.247127599712
2005	4495.404029809572
2006	4592.112652132827
2007	4809.087674701497
2008	5068.99387547211
2009	5178.512837057062
2010	5173.891311105376
2011	5220.393152874553
2012	5323.3464853883015
2013	5502.959821511249
2014	5590.578629612124
2015	5603.004666508311
2016	5598.882163231217
2017	5521.394799047226
2018	5521.457270382946
2019	5581.977368481135
2020	5483.019712878259
2021	5550.221737088954
2022	5625.032347147821