Year	Percent
1961	2.15005
1962	1.35317
1963	3.60871
1964	0.18055
1965	2.02734
1966	1.30107
1967	2.24708
1968	1.93203
1969	1.67636
1970	0.81686
1971	2.43516
1972	2.45971
1973	5.84868
1974	0.65931
1975	2.63734
1976	5.81858
1977	2.7252
1978	2.32179
1979	2.78135
1980	2.30267
1981	0.62383
1982	0.81943
1983	-0.87056
1984	-9.81077
1985	-9.78021
1986	0.67324
1987	1.56478
1988	3.9735
1989	3.48535
1990	0.44974
1991	-3.02223
1992	-2.07854
1993	-0.29642
1994	1.96139
1995	2.28118
1996	3.46011
1997	2.85511
1998	-2.74496
1999	0.86444
2000	2.19458
2001	0.73221
2002	1.49692
2003	2.84662
2004	4.62293
2005	2.83968
2006	3.40299
2007	4.84468
2008	2.47903
2009	-0.46289
2010	5.90312
2011	1.97196
2012	4.93411
2013	5.30893
2014	4.42621
2015	4.38341
2016	5.21666
2017	5.05975