Year	Percent
1961	3.223
1962	-0.07571
1963	1.78919
1964	3.28721
1965	2.98297
1966	2.68442
1967	4.865
1968	2.25206
1969	4.75402
1970	5.13321
1971	5.18534
1972	6.18904
1973	8.98327
1974	16.38147
1975	16.48963
1976	14.01838
1977	11.41853
1978	8.23603
1979	8.63489
1980	10.0157
1981	9.52596
1982	11.70903
1983	10.15768
1984	7.86335
1985	4.62854
1986	6.42849
1987	7.12719
1988	7.29937
1989	9.24796
1990	6.10436
1991	3.0247
1992	1.45667
1993	0.87971
1994	1.02698
1995	2.27265
1996	2.69578
1997	1.23334
1998	1.2729
1999	0.35507
2000	2.57948
2001	4.62148
2002	2.86026
2003	3.11341
2004	3.30903
2005	3.79576
2006	5.09293
2007	5.01431
2008	4.52509
2009	5.00347
2010	1.1638
2011	6.25869
2012	1.87444
2013	-0.1579
2014	1.43995
2015	-0.72803
2016	-0.45837
2017	3.70145