Year	Percent
1995	22.74039
1996	21.05712
1997	24.57444
1998	24.33564
1999	21.34312
2000	18.7588
2001	19.01976
2002	20.63295
2003	21.80111
2004	22.68149
2005	24.05369
2006	26.72534
2007	32.10931
2008	27.88716
2009	12.37117
2010	17.9999
2011	21.7162
2012	19.37377
2013	19.46164
2014	19.02908
2015	20.58346
2016	17.24465
2017	17.45338