Year	% gross
1970	3.57352995872498
1971	3.71737003326416
1972	3.94714999198914
1973	4.25981998443604
1974	4.24083995819092
1975	5.03893995285034
1976	6.12665987014771
1977	7.32543992996216
1978	8.30580043792725
1979	8.0179500579834
1980	9.01848983764648
1981	9.51111030578613
1982	9.68278026580811
1983	11.4025802612305
1984	10.7205400466919
1985	11.3576402664185
1986	12.0224800109863
1990	11.5814304351807
1991	12.2805500030518
1992	12.6481199264526
1993	12.7704601287842
1994	13.4859199523926
1995	13.7071895599365
1996	14.9376802444458
1997	15.6424503326416
1998	12.4479999542236
1999	16.2816600799561
2000	20.4942893981934
2003	28.231330871582
2004	29.4298095703125
2005	29.378490447998
2006	32.6925086975098
2007	33.5194206237793
2008	35.9907112121582
2009	37.3096885681152
2010	39.5773887634277
2011	40.3307800292969
2012	39.4089202880859
2013	38.8545913696289
2014	39.0578117370605
2015	37.9266014099121
2016	39.2824897766113
2017	41.1467590332031
2018	41.1197814941406
2019	39.7553215026855
2020	39.3609008789063
2021	33.7702293395996