Year	gross (GPI)
1976	0.682500004768372
1977	0.824790000915527
1978	0.765609979629517
1993	1.09889996051788
1999	1.13622999191284
2000	1.17104995250702
2001	1.12380003929138
2002	1.10246002674103
2003	1.13398003578186
2004	1.15876996517181
2005	1.11600995063782
2006	1.06617999076843
2007	1.18875002861023
2008	1.17337000370026
2009	1.18472003936768
2010	1.23693251609802
2011	1.23313224315643
2012	1.25630903244019
2013	1.27547001838684
2014	1.27650594711304
2016	1.30106437206268
2017	1.2951797246933
2018	1.30472314357758
2019	1.28752911090851
2020	1.28331518173218
2021	1.27169668674469
2022	1.26894593238831
2023	1.27702915668488