Year	constant 2015 US$
1990	7079.948711490601
1991	6300.406363717032
1992	6079.921664093393
1993	6941.320995843787
1994	7228.913638564007
1995	7884.760958157535
1996	8106.834203655025
1997	8349.251044309898
1998	8610.713608298436
1999	9173.954417261588
2000	9135.232407867546
2001	9381.336795561774
2002	9593.82228350025
2003	9924.012021799088
2004	10169.178458907836
2005	10361.326754824724
2006	10461.59352289238
2007	11081.394978608007
2008	11381.347263305575
2009	11512.793939688976
2010	11574.362187367165
2011	11641.970887566042
2012	11363.105448564009
2013	10901.000654736185
2014	11067.120698128281
2015	11283.129774789693
2016	11776.409693973153
2017	11992.720060353155
2018	12370.145818937288
2019	12955.223839311866
2020	12034.192941786818
2021	13234.265384647504
2022	13686.69554751076
2023	13804.412829895826