Year	constant 2015 US$
1995	10606.550307437834
1996	11205.688832977818
1997	11193.882522668882
1998	11437.708037832419
1999	11544.927497102264
2000	11851.001677859396
2001	12341.836864508005
2002	12701.225115104682
2003	13213.496772585944
2004	13733.60459587376
2005	14432.174674382071
2006	14901.567951319392
2007	15707.443562125207
2008	15901.356593989158
2009	15108.239185316956
2010	15141.311556269862
2011	15120.056823465533
2012	15196.173738261941
2013	15321.861726509404
2014	15761.809343544955
2015	16606.858293053265
2016	17104.543374008183
2017	17973.394473117834
2018	18488.501468971484
2019	18899.66142892546
2020	18171.84085236949
2021	19327.57790139031
2022	18837.768986471074