Year	constant 2015 US$
1991	6812.377826775166
1992	5402.538921779558
1993	4988.04830059904
1994	5324.788102067723
1995	5330.133153949624
1996	6017.619436780515
1997	6117.8400299014675
1998	6108.136111155341
1999	6649.83011978983
2000	6650.6519106604
2001	6543.717942568569
2002	6813.28124189699
2003	7494.574816190524
2004	6639.654818652583
2005	8108.395719124037
2006	7983.41301738326
2007	7886.150769625591
2008	8614.226426847637
2009	9337.075842509137
2010	8216.247116098793
2011	8672.277086248489
2012	9835.041344852956
2013	10475.42809206492
2014	9709.161771076973
2015	10125.706720776458
2016	9283.026154394845
2017	8773.21095722297
2018	9130.183372478285
2019	9055.33166534109
2020	8407.067680412132
2021	8526.915425191475
2022	8714.922867018055