Year	% gross
1970	1.64049005508423
1971	1.64458000659943
1972	1.70661997795105
1973	1.76766002178192
1974	1.85584998130798
1975	1.92176997661591
1976	2.00056004524231
1977	2.11174011230469
1978	2.26341009140015
1979	2.45542001724243
1980	2.58814001083374
1981	2.76813006401062
1982	2.92326998710632
1983	2.99703001976013
1984	3.1115300655365
1985	3.31479001045227
1986	3.49292993545532
1987	3.5390899181366
1988	3.76716995239258
1989	3.96272993087769
1990	4.04502010345459
1991	4.14088010787964
1992	4.23417997360229
1993	4.45321989059448
1994	4.57597017288208
1995	4.55568981170654
1996	4.57405996322632
1997	4.62891006469727
1998	4.64263010025024
1999	4.69549989700317
2000	5.14592981338501
2001	5.61541986465454
2002	6.01523017883301
2003	6.51706981658936
2004	6.76498985290527
2005	7.1218900680542
2006	7.29376983642578
2007	7.51000022888184
2008	7.9507098197937
2009	8.40795040130615
2010	8.98149013519287
2011	9.4801197052002
2012	9.75625991821289
2013	10.1288604736328
2014	10.3246603012085
2015	10.402759552002
2016	10.3531303405762
2017	10.4503002166748
2018	10.4862403869629
2019	10.4111299514771
2020	10.6925001144409
2021	10.4996995925903