Year	constant 2015 US$
1995	4739.205989620185
1996	5122.0295565506385
1997	5901.392248790024
1998	6548.03268752194
1999	6646.023540741287
2000	7226.947847396991
2001	7927.143454223311
2002	8500.857561383218
2003	7272.708358063387
2004	8056.677635475223
2005	7667.03817323062
2006	10023.197229237156
2007	10063.025976854222
2008	10194.160800927792
2009	9636.663273703523
2010	8513.822596984193
2011	8417.976878560366
2012	8460.63506842981
2013	10373.52779976788
2014	9850.560543414465
2015	10262.390572021797
2016	13215.539161202207
2017	13846.609265942849
2018	16211.783387153886
2019	16437.871379764343
2020	15954.444794333289
2021	17104.248649933677
2022	18663.644355152945