Year	% gross
1970	1.3758499622345
1971	1.3790500164032
1972	1.41410994529724
1973	1.45297002792358
1974	1.51219999790192
1975	1.55650997161865
1976	1.61088001728058
1977	1.68626999855042
1978	1.78533005714417
1979	1.91139996051788
1980	2.00318002700806
1981	2.12887001037598
1982	2.23851990699768
1983	2.29065990447998
1984	2.37438011169434
1985	2.51766991615295
1986	2.65527009963989
1987	2.71926999092102
1988	2.86270999908447
1989	3.00609993934631
1990	3.06625008583069
1991	3.17903995513916
1992	3.29257011413574
1993	3.49574995040894
1994	3.67250990867615
1995	3.68099999427795
1996	3.72940993309021
1997	3.80545997619629
1998	3.86708998680115
1999	3.96690011024475
2000	4.35871982574463
2001	4.74666976928711
2002	5.10545015335083
2003	5.4871997833252
2004	5.73162984848022
2005	6.04299020767212
2006	6.23023986816406
2007	6.41648006439209
2008	6.76648998260498
2009	7.18607997894287
2010	7.65972995758057
2011	8.01301956176758
2012	8.35278034210205
2013	8.71875
2014	8.88142013549805
2015	8.99899005889893
2016	9.01580047607422
2017	9.14606952667236
2018	9.24536037445068
2019	9.23880004882812
2020	9.5613899230957
2021	9.39855003356934