Year	constant 2011 PPP $
1991	19896.23828125
1992	19837.2265625
1993	21560.98046875
1994	21235.845703125
1995	21842.439453125
1996	21655.587890625
1997	21437.556640625
1998	20722.36328125
1999	20803.509765625
2000	20767.45703125
2001	20719.185546875
2002	20781.42578125
2003	20786.994140625
2004	20762.7265625
2005	20699.9765625
2006	20827.796875
2007	20757.431640625
2008	20495.7734375
2009	19607.28515625
2010	19304.869140625
2011	19504.16015625
2012	19433.21875
2013	19330.408203125
2014	18808.365234375
2015	18685.4453125
2016	18409.4453125
2017	17941.669921875
2018	17761.505859375
2019	18143.576171875