Year	constant 2010 US$
1991	3846.8666021242
1992	3852.7363429365
1993	3831.29336991347
1994	3952.11272257849
1995	4090.4857236975
1996	4253.40831943743
1997	4144.17647567437
1998	4428.18782660453
1999	4430.51238420505
2000	4577.37974372445
2001	4604.05003380059
2002	4667.96632352497
2003	4865.86306781633
2004	4813.51543083771
2005	4993.43737865663
2006	5251.24954714829
2007	5626.58096100245
2008	5792.01266394751
2009	5471.72459898939
2010	5890.37660376771
2011	6063.20624036841
2012	6410.6025094359
2013	6863.67007761227
2014	7065.18414536353
2015	6955.20885774198
2016	6845.45783371239
2017	7276.16210373046
2018	7189.53800587273