Year	Percent
1960	-0.2807
1961	-0.14859
1962	0.41163
1963	0.58361
1964	0.48608
1965	0.37431
1966	0.39888
1967	0.4714
1968	0.45033
1969	0.5848
1970	0.83533
1971	1.1699
1972	1.4862
1973	1.60388
1974	1.65668
1975	1.64535
1976	1.50915
1977	1.35426
1978	1.41881
1979	1.33229
1980	1.15082
1981	1.17103
1982	0.94542
1983	0.70894
1984	0.61971
1985	0.16007
1986	0.04544
1987	0.01037
1988	-0.42769
1989	-0.39625
1990	0.08441
1991	0.57493
1992	0.68226
1993	0.49984
1994	0.39419
1995	0.5127
1996	0.79127
1997	1.00281
1998	1.04308
1999	1.1273
2000	1.33304
2001	1.59215
2002	1.68515
2003	1.62895
2004	1.82831
2005	2.1787
2006	2.69601
2007	2.89096
2008	2.03871
2009	1.01566
2010	0.54488
2011	0.43607
2012	0.42374
2013	0.52656
2014	0.731
2015	0.94485
2016	1.12883
2017	1.21798