Year	gross (GPI)
1971	0.449110001325607
1972	0.487280011177063
1973	0.490449994802475
1974	0.504270017147064
1975	0.531870007514954
1976	0.52904999256134
1977	0.563929975032806
1978	0.617540001869202
1979	0.718550026416779
1980	0.79544997215271
1981	0.883719980716705
1982	0.709469974040985
1983	0.760890007019043
1984	0.786960005760193
1985	0.836419999599457
1986	0.862950026988983
1987	0.973510026931763
1988	1.06561994552612
1989	1.0387099981308
1990	1.11107003688812
1991	1.01335000991821
1992	1.03161001205444
1993	1.06807994842529
1994	1.03863000869751
1996	0.959159970283508
1997	0.974370002746582
2000	1.10609996318817
2002	0.996469974517822
2003	1.07571995258331
2004	1.0827100276947
2005	1.04946994781494
2006	1.10113000869751
2007	1.0898300409317
2008	1.09241998195648
2009	1.09101998806
2010	1.12020003795624
2011	1.14157998561859
2012	1.1423100233078
2015	1.17153000831604
2016	1.14855003356934
2017	1.18893003463745
2018	1.20492005348206
2019	1.18643999099731
2020	1.20380997657776
2021	1.24445998668671
2022	1.25341999530792