Year	gross (GPI)
1970	0.98786997795105
1980	0.998809993267059
1982	1.01092994213104
1983	1.01131999492645
1984	1.02798998355865
1991	1.04298996925354
2006	1.06281995773315
2007	1.07398998737335
2008	1.07653999328613
2010	1.0725200176239
2011	1.06903004646301
2012	1.06819999217987