Year	Percent
1961	1.15707
1962	3.40287
1963	4.54619
1964	5.08351
1965	3.30595
1966	1.66434
1967	4.34755
1968	1.37504
1969	1.9009
1970	2.39365
1971	1.42202
1972	-1.14601
1973	1.70158
1974	3.24239
1975	-0.99239
1976	-0.37983
1977	-2.6026
1978	0.46321
1979	1.21909
1980	3.95718
1981	2.69511
1982	-2.91847
1983	-4.31857
1984	2.53453
1985	-3.51516
1986	-2.18685
1987	-0.04337
1988	2.05565
1989	0.24787
1990	-2.49304
1991	-3.27744
1992	-4.43038
1993	-1.12759
1994	0.93313
1995	0.98594
1996	2.33637
1997	0.86343
1998	-1.10255
1999	0.79824
2000	2.62955
2001	1.28103
2002	2.25436
2003	1.604
2004	3.25723
2005	4.04108
2006	4.43992
2007	4.25675
2008	2.11651
2009	-2.61734
2010	1.81363
2011	1.9426
2012	0.7964
2013	1.01906
2014	0.40505
2015	-0.0973
2016	-0.73489
2017	0.06657