Year	gross (GPI)
1970	0.670440018177032
1971	0.688759982585907
1972	0.719299972057343
1973	0.764689981937408
1974	0.797609984874725
1975	0.824769973754883
1976	0.828369975090027
1977	0.900430023670197
1978	0.949169993400574
1979	0.991069972515106
1980	1.02385997772217
1981	1.04077994823456
1982	1.05074000358582
1983	1.04463005065918
1984	1.05425000190735
1985	1.07091999053955
1986	1.08708000183105
1987	1.10584998130798
1988	1.12993001937866
1989	1.15112996101379
1990	1.19254004955292
1991	1.19910001754761
1992	1.20597004890442
1993	1.20931994915009
1994	1.21219003200531
1995	1.22267997264862
1996	1.22881996631622
1997	1.23502004146576
1998	1.24058997631073
1999	1.24150002002716
2000	1.24795997142792
2001	1.25710999965668
2002	1.26722002029419
2003	1.27626001834869
2004	1.28426003456116
2005	1.2950199842453
2006	1.29290997982025
2007	1.28873002529144
2008	1.28365004062653
2009	1.27947998046875
2010	1.27385997772217
2011	1.27053999900818
2012	1.27090001106262
2013	1.27126002311707
2014	1.26569998264313
2015	1.26405000686646
2016	1.25823998451233
2017	1.26598000526428
2018	1.26912999153137
2019	1.27691996097565
2020	1.29063999652863
2021	1.32062995433807
2022	1.31903994083405