Year	Percent
1966	6.31299
1967	5.21291
1968	3.51314
1969	3.80235
1970	10.97508
1971	1.41004
1972	1.80246
1973	5.54908
1974	7.86755
1975	6.59138
1976	5.33526
1977	6.17039
1978	6.80376
1979	6.58268
1980	3.6985
1981	4.40743
1982	1.14157
1983	3.38925
1984	4.53054
1985	4.02567
1986	-8.98724
1987	0.44932
1988	4.51558
1989	-7.43865
1990	-14.76516
1991	-21.6531
1992	-45.32511
1993	-29.84129
1994	-9.4877
1995	5.36547
1996	14.04017
1997	12.57987
1998	4.12279
1999	3.67327
2000	2.62662
2001	5.56765
2002	6.18555
2003	12.5041
2004	7.2538
2005	11.0383
2006	10.81139
2007	13.83018
2008	3.63423
2009	-2.39063
2010	7.6567
2011	8.6327
2012	7.74069
2013	4.72867
2014	5.99885
2015	3.15433
2016	2.78814
2017	5.04823