Year	constant 2015 US$
1995	17948.88697730321
1996	19104.86672078372
1997	21468.491773974816
1998	22448.284448862905
1999	23024.005694856012
2000	25051.160919085043
2001	26162.546619139335
2002	25581.699784895995
2003	27298.704772555546
2004	29922.600419143782
2005	32113.420483932903
2006	32854.6978895273
2007	35296.08404359753
2008	33771.21813721682
2009	31045.443506350464
2010	32408.538993835762
2011	33092.77202150653
2012	32702.550996561393
2013	32266.257659843064
2014	32587.127924669494
2015	32680.081023515864
2016	33029.40447012319
2017	34409.25167674408
2018	35267.55909064061
2019	35511.95806373835
2020	36365.20094644118
2021	38593.3848417197
2022	37379.914151282734