Year	Percent
1961	3.19645
1962	-0.07708
1963	-1.3122
1964	5.04012
1965	3.87908
1966	3.87405
1967	8.62658
1968	1.89854
1969	1.13927
1970	4.3069
1971	5.24124
1972	6.20919
1973	15.54371
1974	25.43683
1975	24.03611
1976	11.85582
1977	9.09489
1978	9.03488
1979	6.58805
1980	9.06212
1981	9.91353
1982	9.37165
1983	5.27408
1984	9.65355
1985	4.53494
1986	3.29201
1987	4.5182
1988	9.61756
1989	8.58505
1990	6.452
1991	13.0614
1992	10.05708
1993	8.69647
1994	12.88933
1995	13.87464
1996	8.37361
1997	13.38351
1998	7.52604
1999	5.86229
2000	24.89115
2001	7.89116
2002	2.46309
2003	4.4384
2004	7.74925
2005	7.02647
2006	19.0522
2007	7.27432
2008	13.20401
2009	20.66652
2010	10.85024
2011	19.64466
2012	5.96857
2013	6.96594
2014	7.41155
2015	4.11025
2016	0.40024
2017	4.00052