Year	constant 2010 US$
1991	467.510751056804
1992	480.046718669776
1993	457.09891838972
1994	412.12441676978
1995	381.934781352196
1996	384.741559414999
1997	398.097215295291
1998	406.66447077244
1999	399.681166422214
2000	374.790585189441
2001	351.515459749978
2002	354.527928447042
2003	330.302116494158
2004	315.491012691755
2005	284.957230635744
2006	283.56865493735
2007	248.168340493401
2008	243.991763547222
2009	233.438454761565
2010	229.646107645323
2011	220.570364928857
2012	219.449710088678
2013	231.650614057826
2014	217.877146850329
2015	203.647947158196
2016	186.658057823516
2017	207.140196351104
2018	206.225953391667