Year	Percent
1999	12.87722
2000	11.29283
2001	13.38435
2002	10.40078
2003	9.26585
2008	10.45622
2009	12.1906
2010	10.99529
2011	11.58752
2012	10.89138
2013	9.91984
2014	11.67385
2015	11.00348