Year	gross (GPI)
1999	0.557709991931915
2001	0.624210000038147
2002	0.656639993190765
2003	0.685419976711273
2004	0.704370021820068
2005	0.738820016384125
2008	0.803600013256073
2010	0.815270006656647
2011	0.814350008964539
2012	0.82600998878479
2013	0.83882999420166
2016	0.871720016002655