Year	% gross
1971	27.8988094329834
1972	26.4939403533936
1980	34.3989105224609
1981	31.3013591766357
1982	26.7156105041504
1983	27.8098392486572
1985	25.7182998657227
1992	24.2446002960205
1996	21.3458404541016
1999	27.2949905395508
2000	26.5728206634521
2001	29.999719619751
2002	30.6287002563477
2003	29.69455909729
2004	32.5747108459473
2005	34.1002502441406
2006	34.956470489502
2007	36.5964584350586
2008	37.2153015136719
2009	38.157341003418
2010	38.3799896240234
2011	42.0582313537598
2012	40.1224098205566
2013	42.9888114929199
2014	36.9100914001465
2015	37.1437187194824
2016	36.0904998779297
2017	37.805248260498
2018	40.4486808776855
2019	43.6259002685547