Year	% gross
1971	5.13404989242554
1972	5.67237997055054
1974	7.70596981048584
1975	9.09179973602295
1976	9.92061042785645
1977	9.72416973114014
1978	10.7802400588989
1979	11.7988195419312
1980	13.0158004760742
1981	13.7091598510742
1982	14.3176202774048
1983	14.5866098403931
1984	15.0586795806885
1986	15.7313995361328
1987	15.5893898010254
1988	16.3587398529053
1989	15.9478902816772
1990	15.544150352478
1991	15.0283699035645
1993	14.3130397796631
1994	14.6895999908447
1995	15.1806402206421
1996	16.2998504638672
1997	17.0737800598145
1998	18.19162940979
1999	19.2353000640869
2000	20.5259704589844
2001	21.3776397705078
2002	22.3153591156006
2003	23.0477905273438
2004	23.7031497955322
2005	24.130989074707
2006	24.5689697265625
2007	25.1474304199219
2008	25.7789402008057
2009	26.2105903625488
2010	27.1670207977295
2011	28.0361595153809
2012	29.3496494293213
2013	30.3301601409912
2014	31.2052898406982
2015	31.9718608856201
2016	38.589771270752
2017	40.3390693664551
2018	41.6382789611816
2019	43.0441398620605
2020	45.1654510498047
2021	45.6506195068359
2022	46.4061317443848