Year	Percent
1980	0.73254
1984	2.55038
1986	1.55638
1987	1.59059
1988	2.28028
1991	0.22899
1992	0.07461
1993	0.08426
1995	0.60895
1996	0.12968
1997	0.12082
1998	0.96843
1999	2.3734
2000	1.65717
2001	1.11742
2002	1.14281
2003	1.70221
2004	1.7238
2005	1.14081
2006	2.18833
2007	1.52799
2008	0.96717
2009	-0.64093
2010	0.48437
2011	4.08981
2012	-0.25476
2013	1.23399
2014	1.71229
2015	2.00936
2016	1.64923
2017	1.02315