Year	constant 2010 US$
1991	19622.6813025706
1992	20640.0168940652
1993	23570.8832126167
1994	25027.9920973288
1995	27021.3737149504
1996	29258.9899765213
1997	31172.7305177719
1998	32451.6083942769
1999	36128.6433952971
2000	36541.3871780281
2001	34879.1733366088
2002	34755.3945401803
2003	34352.4468302079
2004	42430.2757337311
2005	40063.5051074823
2006	38680.2065320191
2007	41459.9605400102
2008	44711.4570238975
2009	44957.9953282665
2010	44601.258485429
2011	46563.2365705256
2012	45401.9609975852
2013	47813.2116589841
2014	45776.5551637315
2015	46194.5892075824
2016	44188.3379820113
2017	43116.2071221563
2018	43582.3148970193