Year	Percent
1998	13.45102
1999	14.26064
2000	12.6404
2002	15.76896
2003	16.59645
2006	13.62845
2008	18.41026
2009	21.73583
2010	20.79146
2011	17.14806
2012	23.36558
2013	16.2775
2014	23.4822