Year	gross (GPI)
1980	0.320910006761551
1981	0.338910013437271
1982	0.28209000825882
1983	0.276690006256104
1984	0.24932000041008
1985	0.250440001487732
1986	0.257270008325577
1987	0.28931000828743
1988	0.271770000457764
1989	0.210789993405342
1990	0.307090014219284
1991	0.310169994831085
1992	0.3230299949646
1993	0.288720011711121
1994	0.343620002269745
1995	0.39767000079155
1996	0.415039986371994
1999	0.364769995212555
2000	0.358990013599396
2002	0.375699996948242
2004	0.482459992170334
2005	0.475749999284744
2006	0.435779988765717
2007	0.433050006628036
2010	0.537190020084381
2011	0.57422000169754
2012	0.631675899028778
2014	0.753535330295563
2015	1.11560046672821
2018	0.573165237903595
2020	0.619410395622253
2021	0.641694903373718
2022	0.684897422790527