Year	constant 2010 US$
1991	2315.45571816857
1992	2326.47548173965
1993	2326.60498882028
1994	2329.13245255899
1995	2350.19591208721
1996	2353.59390358069
1997	2359.52598457898
1998	2379.34681893808
1999	2294.44822600718
2000	2225.05716271085
2001	2317.31251947488
2002	2500.06298515843
2003	2634.05664777684
2004	2470.85065956247
2005	2560.64254108344
2006	2631.15620567182
2007	2697.97558422936
2008	2640.71280188109
2009	2667.51104981099
2010	2592.425754509
2011	2364.80192879971
2012	2554.71238238045
2013	2943.42156869163
2014	2851.24100288452
2015	2832.41533609669
2016	3055.38785165036
2017	3047.17969075266
2018	3041.63450621057