Year	gross (GPI)
1980	1.02945995330811
1981	1.03617000579834
1982	1.02898001670837
1983	1.01749002933502
1984	1.01926004886627
1985	1.01753997802734
1986	1.01961994171143
1987	1.00946998596191
1988	1.00497996807098
1989	1.00075995922089
1990	0.997979998588562
1991	0.997959971427917
1992	0.993019998073578
1993	0.989019989967346
1994	0.991299986839294
1995	1.00058996677399
1996	0.993629992008209
1997	1.01037001609802
1998	1.02781999111176
1999	1.02717995643616
2000	1.00040996074677
2001	1.00106000900269
2002	1.00107002258301
2003	1.00337994098663
2004	1.00585997104645
2005	1.00207996368408
2006	1.00018000602722
2007	0.999580025672913
2008	0.99864000082016
2009	1.00782001018524
2010	1.00531005859375
2011	1.00252997875214
2012	1.0003399848938
2013	0.997900009155273
2014	1.00457000732422
2015	1.00531005859375
2016	0.99728000164032
2017	0.994660019874573
2018	0.995459973812103
2019	0.99549001455307
2020	0.98827999830246