Year	% gross
1970	34.7351989746094
1971	36.2079086303711
1972	38.6823997497559
1973	41.415958404541
1974	44.7666397094727
1975	54.6259384155273
1976	64.6830978393555
1977	72.5979232788086
1978	91.9826202392578
1979	94.7489013671875
1980	95.2415466308594
1981	96.0782928466797
1982	91.5603790283203
1983	89.1790313720703
1984	84.0102996826172
1985	73.5048522949219
1986	70.5419692993164
1987	68.2056121826172
1988	66.0642623901367
1989	66.1755523681641
1990	66.9468231201172
1991	67.9841613769531
1992	68.2440872192383
1993	69.3733901977539
1994	67.8884429931641
1995	66.6784133911133
1996	66.5022277832031
1997	68.2349472045898
1998	66.4513397216797
1999	67.5773468017578
2000	68.9705276489258
2001	75.0818710327148
2002	90.3044891357422
2003	96.9844818115234
2004	102.11759185791
2005	105.995071411133
2006	108.850700378418
2007	110.53955078125
2008	111.032493591309
2009	105.07649230957
2010	101.978530883789
2011	96.5907821655273
2012	93.6281814575195
2013	89.4502182006836
2014	85.9815368652344
2015	83.8203430175781
2016	84.0087432861328
2017	87.6228332519531
2018	92.3521575927734
2019	94.7817535400391
2020	95.8801498413086
2021	96.0837631225586
2022	95.504997253418