Year	gross (GPI)
1970	0.710290014743805
1993	0.855929970741272
1996	1.19688999652863
1999	1.27743005752563
2000	1.268630027771
2001	1.27718997001648
2002	1.28821003437042
2003	1.27838003635406
2004	1.25837004184723
2005	1.12036001682281
2007	1.26231002807617
2008	1.26559996604919
2009	1.30681002140045
2010	1.29277002811432