Year	% gross
1983	14.4104900360107
1984	14.2100896835327
1985	14.0318002700806
1986	14.2328100204468
1990	15.1799697875977
1991	14.9280700683594
1992	14.9625101089478
1993	14.711350440979
1994	14.6616897583008
1995	14.7314500808716
1996	15.2271203994751
1997	14.334059715271
1998	14.4105796813965
1999	13.627329826355
2000	14.6317901611328
2001	15.3509998321533
2002	16.1963405609131
2003	17.989330291748
2004	18.9599208831787
2005	20.2152500152588
2006	21.5120296478271
2007	18.6573009490967
2008	18.4562606811523
2009	19.4560604095459
2010	19.5890407562256
2011	20.2895603179932
2012	22.6002101898193
2013	24.2633590698242
2014	25.1952800750732
2015	26.5743198394775
2016	28.3612098693848
2017	28.901180267334
2018	28.7684707641602
2019	29.0484199523926
2020	30.0325298309326