Year	Percent
2000	31.16699
2001	29.22187
2002	25.86236
2003	22.47964
2004	18.94671
2005	15.13782
2006	12.91734
2007	11.27264
2008	9.03484
2009	9.52797
2010	7.15648
2011	6.94159
2012	6.40208
2013	5.59248
2014	5.22851
2015	6.53194
2016	9.52397