Year	Percent
1995	28.15442
1996	27.09779
1997	26.95262
1998	27.25836
1999	26.27516
2000	26.30261
2001	27.04226
2002	26.24844
2003	27.82678
2004	29.55601
2005	29.60832
2006	29.99766
2007	29.58728
2008	29.18913
2009	25.05664
2010	26.14351
2011	27.96178
2012	27.82467
2013	27.2577
2014	27.4963
2015	26.73286
2016	25.82111
2017	26.41877