Year	constant 2010 US$
1997	184.506668435642
1998	198.398531879592
1999	190.87605002
2000	185.352636163906
2001	182.592449234146
2002	192.356261049948
2003	180.567293685261
2004	181.930143236968
2005	198.498526190484
2006	212.196913796499
2007	202.325826866538
2008	202.541650758936
2009	196.606122387382
2010	189.823679553593
2011	198.275444453536
2012	199.702192139229
2013	213.925121866022
2014	215.135860278979
2015	204.177402612057
2016	194.421324973803
2017	188.639602527783
2018	190.435268210403