Year	%
2000	30.903944586945258
2001	30.301082969576942
2002	29.97161283874571
2003	29.61585561390181
2004	29.221241228904006
2005	28.827243028648777
2006	28.52086250733124
2007	28.233389070680893
2008	28.20193185299789
2009	28.045473977789737
2010	27.720158300419524
2011	27.51867053830228
2012	27.167254432580926
2013	26.85265738724512
2014	26.5016544100814
2015	26.219386316529416
2016	25.932442545591982
2017	25.637011135025805
2018	25.473693913001224
2019	25.331188372933386