Year	Percent
1962	-2.34661
1963	3.31097
1964	1.59871
1965	1.16755
1966	-1.80354
1967	1.83888
1968	12.09837
1969	1.29849
1970	12.50847
1971	1.49845
1972	8.96686
1973	12.74859
1974	24.37874
1975	5.35029
1976	9.97557
1977	14.69108
1978	10.91789
1979	15.3973
1980	19.97751
1981	20.8853
1982	12.10106
1983	16.90683
1984	20.30052
1985	0.58391
1986	5.91728
1987	7.75149
1988	10.11703
1989	10.92316
1990	20.06328
1991	10.62402
1992	9.40371
1993	9.88439
1994	9.77058
1995	9.30344
1996	10.81746
1997	8.92447
1998	9.21416
1999	4.1627
2000	7.27743
2001	13.6648
2002	8.11157
2003	8.74866
2004	8.80149
2005	10.41873
2006	11.27703
2007	14.02844
2008	16.32702
2009	5.87988
2010	22.79926
2011	3.83139
2012	10.82843
2013	6.23693
2014	2.9121
2015	0.64904
2016	4.08013
2017	8.24372