Year	Percent
1961	5.26406
1962	0.75871
1963	4.69947
1964	8.67799
1965	3.3718
1966	5.98329
1967	4.20762
1968	4.19666
1969	6.40997
1970	13.15406
1971	8.79003
1972	8.16162
1973	8.481
1974	12.89565
1975	8.09539
1976	8.99324
1977	5.34465
1978	5.33489
1979	4.77106
1980	6.22537
1981	6.39009
1982	4.62366
1983	1.38907
1984	2.30711
1985	0.86588
1986	0.2117
1987	-1.04763
1988	0.81964
1989	1.34807
1990	1.55975
1991	3.11705
1992	2.49574
1993	1.59751
1994	2.06273
1995	2.06462
1996	1.19278
1997	2.62524
1998	2.05465
1999	1.43185
2000	3.61661
2001	4.17786
2002	3.6277
2003	2.17098
2004	1.35001
2005	1.93383
2006	2.55043
2007	2.10544
2008	2.47924
2009	0.39962
2010	0.84797
2011	0.1419
2012	1.41967
2013	1.36846
2014	0.15
2015	0.80531
2016	0.58406
2017	1.14615