Year	Percent
1971	44.97702
1972	36.11809
1973	35.01185
1974	303.55252
1975	335.81
1976	392.94482
1977	137.80597
1978	39.84954
1979	94.47619
1980	119.03716
1981	36.41996
1982	16.06369
1983	7.12287
1984	9.41396
1985	10.14114
1986	6.07633
1987	5.16051
1988	3.14943
1989	6.77604
1990	12.34004
1991	13.95303
1992	4.12167
1993	5.34359
1994	4.98356
1995	5.01288
1996	13.7814
1997	27.33376
1998	24.07671
1999	19.41784
2000	31.19609
2001	33.88668
2002	23.80989
2003	20.19823
2004	43.25154
2005	111.17241
2006	444.35676
2007	427.4112
2008	408.25415
2009	285.47004
2010	231.7516
2011	205.30502
2012	262.30277
2013	218.76368
2014	151.46756
2015	108.26292
2016	96.39933