Year	% gross
1971	52.8924293518066
1972	56.0832710266113
1973	58.9477882385254
1974	60.3908386230469
1975	59.9122314453125
1976	60.9247283935547
1977	60.541088104248
1978	61.3673400878906
1979	61.8392486572266
1980	59.1965789794922
1981	57.7360305786133
1982	57.7232818603516
1983	59.1277198791504
1984	61.6149215698242
1985	62.9342613220215
1986	64.0203094482422
1987	64.5431137084961
1988	62.778678894043
1989	61.1886711120605
1990	57.8557014465332
1991	55.1388397216797
1992	51.9101486206055
1993	49.9709701538086
1994	48.6753196716309
1995	47.2095413208008
1996	45.3461685180664
1997	44.7146606445312
1998	45.5593490600586
1999	45.3839797973633
2000	46.0026016235352
2001	47.870849609375
2002	49.4549713134766
2003	64.8208999633789
2004	67.9960327148438
2005	71.3185195922852
2006	72.4030838012695
2007	72.3614730834961
2008	72.4175186157227
2009	73.2477874755859
2010	74.2214202880859
2011	75.7092590332031
2012	76.0630569458008
2013	49.2262001037598
2020	36.141960144043
2021	36.5252304077148
2022	36.2388114929199
2023	36.2291107177734