Year	Percent
1961	9.16119
1962	7.89866
1963	7.37559
1964	10.51914
1965	4.68856
1966	9.63296
1967	10.051
1968	12.50717
1969	10.17649
1970	-0.72959
1971	3.35976
1972	6.9055
1973	7.14198
1974	-3.09292
1975	1.45412
1976	3.2088
1977	3.38919
1978	4.32365
1979	4.59917
1980	2.01465
1981	3.44226
1982	2.61382
1983	2.81992
1984	3.84112
1985	4.59198
1986	2.69887
1987	4.21684
1988	6.3304
1989	4.42963
1990	4.53525
1991	3.09703
1992	0.59804
1993	-0.76316
1994	0.64958
1995	2.35063
1996	2.83929
1997	0.8355
1998	-1.39671
1999	-0.43391
2000	2.60785
2001	0.1647
2002	-0.11454
2003	1.3112
2004	2.17029
2005	1.65312
2006	1.35575
2007	1.53744
2008	-1.14142
2009	-5.40459
2010	4.17303
2011	0.06976
2012	1.65732
2013	2.14753
2014	0.508
2015	1.46144
2016	1.05463
2017	1.88002