Year	%
2000	33.65372361690549
2001	32.954571228850014
2002	32.3718366120377
2003	31.789175825690915
2004	31.18617600632821
2005	30.5074749613063
2006	29.83287250742919
2007	29.136111785756917
2008	28.484038009967776
2009	27.85362557292242
2010	27.259368590162293
2011	26.849294534779695
2012	26.52885661296762
2013	26.333040079917826
2014	26.21277774787445
2015	26.21968474181533
2016	26.325089937696376
2017	26.24402476917197
2018	26.18047897258993
2019	26.185093287997528