Year	gross (GPI)
1970	0.609369993209839
1971	0.60724002122879
1972	0.59935998916626
1973	0.591159999370575
1974	0.590690016746521
1975	0.592079997062683
1976	0.596819996833801
1977	0.611599981784821
1978	0.616859972476959
1979	0.630410015583038
1980	0.628080010414124
1981	0.630659997463226
1982	0.653060019016266
1983	0.638000011444092
1984	0.636520028114319
1985	0.65489000082016
1986	0.64358001947403
1987	0.638180017471313
1988	0.675970017910004
1989	0.683329999446869
1990	0.689339995384216
1991	0.70661997795105
1992	0.712419986724854
1993	0.718829989433289
1994	0.725889980792999
1995	0.736469984054565
1996	0.751330018043518
1997	0.758880019187927
1998	0.767289996147156
1999	0.783510029315948
2000	0.78658002614975
2001	0.803210020065308
2002	0.827130019664764
2003	0.825309991836548
2004	0.820580005645752
2005	0.843410015106201
2006	0.865949988365173
2007	0.848510026931763
2008	0.858179986476898
2009	0.849759995937347
2010	0.853479981422424
2011	0.865729987621307
2012	0.901350021362305
2013	0.943069994449615
2014	0.972869992256165
2015	0.967769980430603
2016	0.986689984798431
2017	0.996559977531433
2018	1.01353001594543
2019	1.03839004039764
2020	1.04699003696442
2021	1.04199004173279
2022	1.03052997589111