Year	constant 2015 US$
1991	7763.603425709671
1992	7652.1836594591305
1993	7470.716920373392
1994	7422.0771857266955
1995	7404.32233779942
1996	7311.851317611378
1997	7309.8725656286415
1998	7321.505997547175
1999	7331.314671650275
2000	7302.206236288929
2001	7406.662136975366
2002	7234.469439999233
2003	7336.576596097754
2004	7452.684276646501
2005	7595.19064469298
2006	7115.907419284426
2007	7292.678811644036
2008	7313.218623540866
2009	7284.770913398001
2010	7318.40717404369
2011	7215.129060006632
2012	7007.243343850455
2013	7129.935657518174
2014	7080.514390246639
2015	6960.052544628519
2016	6859.191860816657
2017	6714.059818394379
2018	6591.213712222125
2019	6450.934362759297
2020	6253.094139554233
2021	6294.179979136266
2022	6229.623681286377