Year	gross (GPI)
1981	1.13267004489899
1982	1.14084005355835
1983	1.09983003139496
1984	1.02567994594574
1985	1.05524003505707
1986	1.11312997341156
1987	1.13239002227783
1988	1.13917994499207
1989	1.15575003623962
1990	1.17346000671387
1991	1.20343005657196
1992	1.11607003211975
1993	1.17818999290466
1994	1.20870995521545
1995	1.25243997573853
1996	1.25743997097015
1997	1.25352001190186
1998	1.23106002807617
1999	1.25841999053955
2000	1.26699995994568
2001	1.26954996585846
2002	1.30831003189087
2003	1.26332998275757
2004	1.27860999107361
2005	1.30604994297028
2006	1.32079005241394
2007	1.32361996173859
2008	1.31857001781464
2009	1.33647000789642
2010	1.33438003063202
2011	1.39695000648499
2012	1.31580996513367
2013	1.30429995059967
2014	1.30392003059387
2015	1.31642997264862
2016	1.30382001399994
2017	1.30157005786896
2018	1.31119000911713
2019	1.33654999732971
2020	1.34552001953125
2021	1.35020005702972
2022	1.34018003940582