Year	gross (GPI)
1972	0.261339992284775
1973	0.237320005893707
1993	0.217439994215965
1994	0.215719997882843
1995	0.196600005030632
1996	0.195539996027946
1997	0.196089997887611
2000	0.344110012054443
2001	0.385720014572144
2002	0.414909988641739
2004	0.467180013656616
2005	0.471379995346069
2006	0.476480007171631
2007	0.5
2008	0.523090004920959
2009	0.570190012454987
2010	0.598479986190796
2011	0.606920003890991
2015	0.762269973754883
2017	0.908179104328156
2018	0.9607994556427
2019	1.20891571044922
2020	1.11471128463745
2021	1.01018142700195
2022	0.881537675857544