Year	Percent
1998	12.03769
1999	11.77651
2000	10.5359
2002	13.7986
2003	14.20995
2006	14.37635
2008	16.62207
2009	19.43481
2010	18.72635
2011	17.87643
2012	12.95161
2013	18.94472
2014	18.10119