Year	Percent
1995	28.12
2001	29.8058
2002	29.1169
2003	22.9417
2004	30.8669
2005	34.0837
2006	31.0577
2007	31.315
2008	25.2866
2009	26.4692
2010	29.483
2011	27.3639
2012	30.3988
2013	29.5393
2014	32.2685
2015	31.2445
2016	29.6965
2017	30.9845