Year	Percent
1996	3.51848
1997	10.06577
1998	7.53093
1999	3.45764
2000	6.42783
2001	7.84516
2002	8.35465
2003	9.48365
2004	9.5243
2005	11.89968
2006	12.92044
2007	10.88057
2008	-2.52864
2009	-12.97671
2010	-1.92043
2011	8.33571
2012	5.33307
2013	3.53281
2014	2.82202
2015	3.81812
2016	3.14717
2017	5.56195