Year	constant 2015 US$
1989	4841.334163885918
1990	5052.935516172962
1991	5037.561056111976
1992	4965.692283796475
1993	5108.325469036679
1994	5301.968665673485
1995	5692.4475834037985
1996	5813.3565573862315
1997	5848.235335592826
1998	5665.636909695098
1999	5364.407069700736
2000	5489.020982838694
2001	5425.47216226847
2002	5493.575770034661
2003	5476.380541215828
2004	5797.628398558237
2005	5848.259470627603
2006	6110.300575070673
2007	6463.83666498484
2008	6638.808837999382
2009	6521.338162306845
2010	6874.7145342755275
2011	7022.170378027352
2012	6878.361022192679
2013	7114.682114068527
2014	6997.644828005078
2015	6552.617212535389
2016	6258.7525892138665
2017	6453.766626704722
2018	6461.9258770633805
2019	6495.749709445062
2020	6281.928541031944
2021	6333.814920129445