Year	Percent
1960	2.26691
1961	1.98974
1962	2.44064
1963	1.91782
1964	1.96235
1965	1.95972
1966	2.28318
1967	1.26228
1968	1.76416
1969	2.09302
1970	1.97019
1971	3.38029
1972	1.83815
1973	1.52882
1974	2.53122
1975	1.23119
1976	1.00266
1977	1.12667
1978	1.16289
1979	1.08064
1980	1.21894
1981	1.58685
1982	1.66754
1983	1.25055
1984	1.13222
1985	1.36735
1986	1.63899
1987	1.52099
1988	1.63621
1989	1.69257
1990	1.47998
1991	1.27458
1992	1.21339
1993	0.97834
1994	1.05851
1995	1.20802
1996	1.31382
1997	1.11873
1998	1.04224
1999	1.14251
2000	1.19227
2001	1.34836
2002	1.22056
2003	1.234
2004	1.15935
2005	1.31979
2006	1.47523
2007	0.62468
2008	2.00402
2009	2.06105
2010	1.55549
2011	1.38953
2012	1.78545
2013	1.75834
2014	1.53588
2015	1.46406
2016	1.49821
2017	1.59039