Year	gross (GPI)
1971	0.159180000424385
1972	0.155349999666214
1973	0.168259993195534
1974	0.19191999733448
1975	0.258289992809296
1976	0.192770004272461
1982	0.243729993700981
1991	0.283279985189438
1992	0.295520007610321
1993	0.238409996032715
1994	0.302799999713898
2005	0.55035001039505
2006	0.51936000585556
2007	0.531989991664886
2008	0.439310014247894
2009	0.606580018997192
2011	0.604849994182587
2012	0.618189990520477
2013	0.631229996681213
2014	0.657790005207062
2015	0.680729985237122
2016	0.701839983463287
2017	0.706740021705627
2018	0.745119988918304
2019	0.824509978294373
2020	0.87882000207901
2021	0.911570012569427
2022	0.941120028495789