Year	gross (GPI)
1976	1.73072004318237
1977	1.74844002723694
1980	1.81288003921509
1981	1.78620004653931
1982	1.72786998748779
1983	1.70144999027252
1984	1.72115004062653
1985	1.69992005825043
1986	1.69102001190186
1987	1.73502004146576
1988	1.75850999355316
1989	1.76919996738434
1990	1.79841005802155
1991	1.79307997226715
1992	1.82138001918793
1993	1.81447005271912
1994	1.80031001567841
1995	1.79430997371674
1996	1.78624999523163
1997	1.77584004402161
1998	1.768630027771
1999	1.77058005332947
2001	1.74844002723694
2002	1.74364995956421
2003	1.75901997089386
2004	1.75823998451233
2005	1.77087998390198
2006	1.81037998199463
2007	1.82892000675201
2008	1.84582996368408
2009	1.86960995197296
2010	1.86196994781494
2011	1.82597994804382
2012	1.84444999694824
2013	1.84095001220703
2014	1.8473299741745
2015	1.86222994327545
2016	1.87425994873047
2017	1.89763998985291
2018	1.90132999420166
2019	1.88729000091553
2020	1.88185000419617
2021	1.79261004924774
2022	1.78702998161316