Year	constant 2010 US$
1991	3106.76321480538
1992	3039.48846179893
1993	2919.37648177949
1994	2808.6893164267
1995	2800.58470340602
1996	2679.34464553885
1997	2750.08940708596
1998	2790.36630916133
1999	2824.20863198507
2000	2811.78950735795
2001	2807.8331795657
2002	2730.19147470051
2003	2751.19743250542
2004	2777.84098354955
2005	2813.59844507098
2006	2908.8952178868
2007	3050.55715880698
2008	3210.80914816007
2009	3272.95263202978
2010	3277.78637335628
2011	3300.73241634741
2012	3350.29319488843
2013	3433.58957551843
2014	3491.69079241101
2015	3508.45872321538
2016	3576.4653672255
2017	3573.09165108707
2018	3679.46063967056