Year	Percent
1999	58.32627
2000	67.2964
2001	45.38064
2002	37.66849
2003	39.17062
2004	43.9057
2005	43.07709
2006	52.84085
2007	48.68401
2008	21.83801
2009	30.01374
2010	25.17855
2011	18.95567
2012	23.24498
2013	28.88828
2014	27.29486