Year	gross (GPI)
1971	0.998929977416992
1972	0.988879978656769
1973	0.989530026912689
1974	0.996550023555756
1976	1.01227998733521
1984	0.999629974365234
1985	1.00973999500275
1986	1.01561999320984
1987	1.00797998905182
1999	0.977670013904572
2001	0.980989992618561
2005	1.0059700012207
2007	0.977810025215149
2008	1.00051999092102
2009	0.987680017948151
2010	1.00057005882263
2011	0.995859980583191
2012	0.995010018348694