Year	% gross
1970	1.64850997924805
1971	2.02722001075745
1972	1.96090996265411
1973	2.15030002593994
1974	2.12380003929138
1975	2.33966994285583
1976	2.37811994552612
1977	2.4194700717926
1978	2.38704991340637
1979	2.79069995880127
1980	2.78305006027222
1981	3.00652003288269
1982	3.57735991477966
1983	3.71720004081726
1984	3.76654005050659
1985	3.95370006561279
1986	3.83452010154724
1987	4.06896018981934
1988	4.29346990585327
1989	4.51326990127563
1990	5.57603979110718
1991	6.69232988357544
1992	6.89039993286133
1993	7.06403017044067
1994	7.23150014877319
1995	7.41716003417969
1996	7.61908006668091
1997	7.95958995819092
1998	8.20110034942627
1999	8.65316009521484
2000	8.62893009185791
2001	8.76974964141846
2002	9.22103977203369
2003	9.59191036224365
2004	9.61981010437012
2005	9.63912010192871
2006	10.9083995819092
2007	12.1631298065186
2008	13.3933095932007
2009	14.6169500350952
2010	15.8060703277588
2011	16.9897804260254
2012	18.1300392150879
2013	19.2752799987793
2014	20.3706893920898
2015	21.426830291748
2016	22.460750579834
2017	23.467399597168
2018	24.5025005340576
2019	25.3175506591797
2020	25.2600402832031