Year	%
2000	40.3506578233819
2001	39.64154551304993
2002	39.06202832779394
2003	39.361759236367156
2004	38.243062168586306
2005	38.74358740737906
2006	38.78287109906584
2007	39.72048966022427
2008	40.14206101425542
2009	39.75424397802965
2010	39.48632910419172
2011	39.38001191067513
2012	39.21710770055114
2013	39.05225058451864
2014	39.02043167252531
2015	38.87328436959183
2016	38.6385016278155
2017	38.49068585855411
2018	38.48928842730513
2019	38.254219676452855