Year	%
2000	34.81359973124235
2001	34.48534700386625
2002	34.170461071828434
2003	33.78811679877861
2004	33.30661712875679
2005	32.86301161484027
2006	32.50440864957305
2007	32.06565142398339
2008	31.64612139198215
2009	31.270459148283642
2010	30.960516771736152
2011	30.76757115155181
2012	30.704495620834052
2013	30.701125655698362