Year	Percent
1961	2.81143
1962	2.65283
1963	2.54222
1964	2.5051
1965	2.51127
1966	2.49288
1967	2.45829
1968	2.42082
1969	2.37888
1970	2.33106
1971	2.02232
1972	2.40971
1973	1.52853
1974	1.82015
1975	2.31182
1976	2.02351
1977	2.09673
1978	0.5874
1979	0.85873
1980	0.91309
1981	1.21608
1982	0.58857
1983	-0.12117
1984	0.59201
1985	0.81102
1986	0.6234
1987	4.24511
1988	0.37303
1989	0.59744
1990	0.49036
1991	1.33196
1992	0.45892
1993	2.08376
1994	2.66577
1995	1.47017
1996	1.46719
1997	1.17345
1998	1.95569
1999	1.9642
2000	0.89266
2001	0.08747
2002	3.05739
2003	-1.13152
2004	-0.37033
2005	0.46331
2006	2.0806
2007	0.51051
2008	2.23628
2009	0.39253
2010	2.79233
2011	-2.62866
2012	0.98098
2013	1.84688
2014	1.5554
2015	2.2298
2016	1.33763
2017	1.22403