Year	Percent
1971	122.21748
1972	96.2761
1973	36.86385
1974	60.43216
1975	43.50324
1976	37.36593
1977	22.72437
1978	15.43572
1979	25.88939
1980	26.82769
1981	19.04067
1982	10.64608
1983	7.9157
1984	5.95057
1985	3.82653
1986	3.52775
1987	3.42919
1988	4.14549
1989	8.68186
1990	8.74263
1991	7.17241
1992	6.79239
1993	7.54679
1994	7.923
1995	11.34537
1996	6.08138
1997	5.80342
1998	6.92298
1999	5.63053
2000	4.87644
2001	8.10775
2002	8.64068
2003	9.15609
2004	10.95765
2005	13.3264
2006	20.19778
2007	42.82179
2008	52.09395
2009	67.93773
2010	73.57348
2011	89.86784
2012	93.78358
2013	121.8499
2014	71.96703
2015	69.07539
2016	75.72266