Year	$ 2011 PPP (USD)
1997	0.0139734
1998	0.0101763
1999	0.0136914
2000	0.0190606
2001	0.019142
2002	0.01717
2003	0.017154
2004	0.0146467
2005	0.0180257
2006	0.0179195
2007	0.0233976
2008	0.0238696
2009	0.0278651
2010	0.0298516
2011	0.0280679
2012	0.0278214
2013	0.0218177