Year	gross (GPI)
1971	0.5867800116539
1972	0.579800009727478
1973	0.598200023174286
1974	0.618539988994598
1975	0.642300009727478
1976	0.655730009078979
1977	0.677089989185333
1978	0.677009999752045
1979	0.677839994430542
1980	0.689689993858337
1981	0.707910001277924
1982	0.723860025405884
1983	0.747820019721985
1984	0.753620028495789
1985	0.743340015411377
1986	0.754679977893829
1987	0.750020027160645
1988	0.763400018215179
1989	0.800140023231506
1990	0.787460029125214
1991	0.809979975223541
1992	0.829670011997223
1993	0.83024001121521
1994	0.96790999174118
1995	0.962050020694733
1996	0.918429970741272
1997	0.979719996452332
1998	0.966409981250763
1999	1.02924001216888
2000	1.03386998176575
2001	1.04621005058289
2002	1.08642995357513
2003	1.06667995452881
2004	1.08847999572754
2005	1.13490998744965
2006	1.17693996429443
2007	1.20789003372192
2008	1.23677003383636
2009	1.27084994316101
2010	1.27778995037079
2011	1.28573000431061
2012	1.2854700088501
2013	1.29008996486664
2014	1.2836400270462
2015	1.28895998001099
2016	1.2880699634552
2017	1.28925001621246
2018	1.28228998184204
2019	1.28250002861023
2020	1.28620994091034
2021	1.27978003025055