Year	% gross
1970	2.72036004066467
1971	2.78439998626709
1972	2.74294996261597
1973	2.84918999671936
1974	3.15635991096497
1975	3.19585990905762
1976	3.30012011528015
1977	3.43143010139465
1978	3.47221994400024
1979	3.53134989738464
1980	3.45449995994568
1981	3.18191003799438
1982	3.15959000587463
1983	3.17600989341736
1984	3.13328003883362
1985	3.4725399017334
1986	3.61844992637634
1987	3.84892988204956
1988	4.18010997772217
1989	4.44110012054443
1991	5.21373987197876
1992	5.24972009658813
1993	5.27152013778687
1994	5.19188976287842
1995	5.14206981658936
1996	5.06101989746094
1997	5.55829000473022
2010	33.3581695556641
2014	31.1841907501221
2015	27.2394905090332
2016	26.3856296539307
2017	26.823299407959
2018	28.7059497833252
2019	30.0738906860352
2020	30.6283493041992
2021	27.9080696105957