Year	constant 2015 US$
1991	4763.408980939576
1992	5096.728959516886
1993	4827.420892315067
1994	4553.2567645261615
1995	4597.829503950849
1996	5315.549294785132
1997	5635.823476678847
1998	5806.854797005469
1999	4540.173746517285
2000	5863.012323476125
2001	6270.529043554675
2002	5445.622565379187
2003	4526.932516718037
2004	6410.611161926889
2005	6140.433284820837
2006	6317.477587763431
2007	6397.80553145466
2008	6552.219034382257
2009	7228.506362752788
2010	7409.391328525494
2011	8600.873125779863
2012	8651.642232387327
2013	9069.402940965554
2014	9054.627492675407
2015	8707.438768242482
2016	9435.464033167891
2017	9652.964808451217
2018	10686.347747981696
2019	12183.723788461783
2020	13698.950905233976
2021	15186.187170063342
2022	15513.808516988094