Year	Percent
1961	-2.01288
1962	6.32475
1963	8.33794
1964	7.97974
1965	5.52735
1966	6.91005
1967	-2.84747
1968	-6.75893
1969	1.42771
1997	4.24647
1998	5.8787
1999	2.64573
2000	3.18054
2001	2.55517
2002	-0.34301
2003	1.65034
2004	7.12962
2005	4.71974
2006	2.5807
2007	6.69438
2008	-0.21404
2009	-6.82375
2010	-3.46682
2011	1.65203
2012	0.78157
2013	3.32615
2014	1.06966
2015	3.2301
2016	5.99983
2017	1.8672