Year	constant 2015 US$
1996	6168.113019674148
1997	5525.805810584929
1998	6111.412512363584
1999	7345.811882775565
2000	7066.153446742564
2001	7561.080482101551
2002	7733.385725196868
2003	7755.250515901855
2004	8290.957720279504
2005	8788.795010788886
2006	9225.87884556249
2007	10214.689150062508
2008	10698.985942200807
2009	11409.524558937648
2010	11232.507377753818
2011	10977.484405314672
2012	11512.411384279862
2013	12140.635256496487
2014	12450.951675596525
2015	12146.848827724009
2016	11818.37917847882
2017	11514.051480519822
2018	11285.501119200731
2019	11280.48355669276
2020	11652.276134253552
2021	12390.415108940786
2022	12656.634367842174