Year	Percent
1995	3.21113
1996	5.23543
1997	7.62627
1998	11.733
1999	17.42706
2000	18.19778
2001	13.65551
2002	14.28445
2003	17.01979
2004	27.64809
2005	30.71571
2006	43.17607
2007	49.32141
2008	17.01251
2009	34.32534
2010	39.78665
2011	26.14142
2012	35.45609
2013	39.01739
2014	30.97982
2015	28.86099
2016	29.42109
2017	38.39642