Year	gross (GPI)
1971	1.16305994987488
1973	1.16567003726959
1979	1.06468999385834
1980	1.05576002597809
1981	1.07788002490997
1982	1.0947699546814
1992	1.30785000324249
1995	1.24972999095917
1996	1.24194002151489
1998	1.22810995578766
1999	1.19307005405426
2001	1.07534003257751
2002	1.22081005573273
2003	1.2152099609375
2004	1.21563994884491
2005	1.18646001815796
2006	1.19776999950409
2008	1.19859004020691
2009	1.19212996959686
2010	1.20034193992615
2011	1.19469857215881
2012	1.1872056722641
2013	1.20606541633606
2014	1.21580815315247
2015	1.22393226623535
2016	1.22361516952515
2017	1.2328040599823
2018	1.23376619815826
2019	1.23127508163452
2020	1.2206084728241
2021	1.26295042037964