Year	% gross
1971	31.3857803344727
1972	34.2082710266113
1973	37.0394287109375
1974	39.9585609436035
1975	42.0693283081055
1984	58.7021484375
1985	60.6896209716797
1986	60.9843101501465
1987	59.978099822998
1988	59.6315383911133
1989	59.016731262207
1991	59.6137504577637
1992	60.6885681152344
1993	61.4797897338867
1999	62.2957916259766
2000	65.0297088623047
2001	68.8771591186523
2002	72.9138031005859
2003	73.892448425293
2004	76.4799575805664
2005	78.7693176269531
2006	81.4078979492188
2007	83.7117233276367
2008	85.0106582641602
2009	85.6526870727539
2010	85.6699676513672
2011	86.52197265625
2012	88.7482070922852
2013	96.5097732543945
2014	95.2444305419922
2015	93.1753005981445
2016	89.3995666503906
2017	88.1067810058594