Year	constant 2010 US$
1996	18297.8489316184
1997	20736.594789888
1998	20998.5195368506
1999	21046.1013948643
2000	19613.8171198845
2001	19530.2497103387
2002	19561.9266420214
2003	19928.8474900635
2004	20290.1933334596
2005	20550.2665234988
2006	21092.6998999509
2007	22802.7817025751
2008	23094.6951834108
2009	22471.6781919999
2010	23579.9174224984
2011	23209.894154164
2012	23305.3065168629
2013	23500.8088061521
2014	23625.6104110669
2015	23542.4413484831
2016	23887.4444701522
2017	22662.1117129167