Year	constant 2011 international $
1991	15155.6583459324
1992	14697.0124248185
1993	14629.0144597774
1994	15080.7830480698
1995	15326.7381924804
1996	15355.2609974722
1997	15900.1518665573
1998	16612.2664667884
1999	17190.3066492359
2000	17960.4720463647
2001	18693.0747343414
2002	19595.2540389586
2003	20407.7718496555
2004	21476.6692872933
2005	22463.7429843124
2006	23365.2157613087
2007	23500.2869284832
2008	23741.8849201475
2009	22209.0617657374
2010	22405.1779035861
2011	22841.2103381104
2012	22584.9144010117
2013	23121.3430648403
2014	24163.1425370978
2015	25077.2306319899
2016	25724.996828069
2017	26860.5733212723
2018	28242.944426515