Year	Percent
1961	1.76303
1962	1.35696
1963	0.93766
1964	2.13617
1965	5.61061
1966	5.77393
1967	3.12244
1968	1.67936
1969	0.21593
1970	7.36964
1971	5.0639
1972	-1.23524
1973	14.67627
1974	21.71062
1975	16.87729
1976	1.15748
1977	2.2425
1978	7.34918
1979	3.58543
1980	11.39853
1981	-2.21203
1982	-6.81234
1983	7.70767
1984	9.44444
1985	-1.87661
1986	4.17569
1987	9.13353
1988	4.23819
1989	1.97318
1990	2.81329
1991	-2.56071
1992	4.01264
1993	1.65071
1994	3.58832
1995	6.07866
1996	1.96873
1997	-1.47678
1998	1.50274
1999	-2.23568
2000	0.45889
2001	-0.22268
2002	1.75284
2003	-2.85943
2004	2.06617
2005	2.68153
2006	4.47832
2007	4.84691
2008	2.73116
2009	-3.00553
2010	1.13724
2011	4.24096
2012	1.95261
2013	1.7464
2014	1.55821
2015	0.56269
2016	2.8388
2017	0.09576