Year	Percent
1961	0.93904
1962	0.97654
1963	1.2708
1964	0.46105
1965	1.46112
1966	2.60861
1967	3.48034
1968	8.98161
1969	6.28106
1970	6.26952
1971	9.54621
1972	9.52577
1973	12.81221
1974	14.98395
1975	6.35703
1976	2.78365
1977	9.2691
1978	4.91871
1979	6.41536
1980	9.85409
1981	17.70939
1982	12.20859
1983	10.99738
1984	10.29655
1985	7.61409
1986	5.83514
1987	6.48815
1988	4.89301
1989	5.63671
1990	6.03357
1991	6.43059
1992	2.81388
1993	5.1963
1994	1.95956
1995	4.17846
1996	29.3647
1997	4.0239
1998	2.74155
1999	2.71215
2000	-4.23636
2001	-1.3692
2002	8.58044
2003	2.82474
2004	4.69214
2005	6.76237
2006	5.37717
2007	5.86641
2008	2.08534
2009	0.33366
2010	1.04891
2011	-0.03257
2012	4.82961
2013	3.2459