Year	gross (GPI)
1970	0.911530017852783
1971	0.912699997425079
1972	0.923449993133545
1973	0.957180023193359
1974	1.01248002052307
1975	1.04367995262146
1976	1.07289004325867
1977	1.09381997585297
1978	1.11132001876831
1979	1.09019994735718
1980	1.08914995193481
1981	1.08515000343323
1982	1.08775997161865
1983	1.08331000804901
1984	1.10206997394562
1985	1.11510002613068
1986	1.14130997657776
1987	1.13802003860474
1988	1.12509000301361
1989	1.11449003219604
1990	1.1224000453949
1991	1.0942599773407
1992	1.11451005935669
1993	1.13001000881195
1994	1.16540002822876
1995	1.19391000270844
1996	1.22497999668121
1997	1.23372995853424
1998	1.21291995048523
1999	1.22677004337311
2000	1.23447000980377
2001	1.25108003616333
2002	1.25653004646301
2003	1.25574994087219
2004	1.25847995281219
2005	1.26524996757507
2006	1.27577996253967
2007	1.28079998493195
2008	1.29130005836487
2009	1.29559004306793
2010	1.31191003322601
2011	1.31825995445251
2012	1.30667996406555
2013	1.3048700094223
2014	1.29631996154785
2015	1.27384996414185
2016	1.28648996353149
2017	1.28354001045227
2018	1.28536999225616
2019	1.29249000549316
2020	1.27186000347137
2021	1.29199004173279
2022	1.28849995136261