Year	%
2000	30.12395365491358
2001	29.36957488929595
2002	29.451115467487185
2003	29.145023430765843
2004	28.757743412815252
2005	28.922246601078264
2006	27.944051198109502
2007	27.495164243611164
2008	26.96143363257965
2009	26.035141532767664
2010	25.50604808112423
2011	24.677341822057453
2012	24.001155493896814
2013	23.387723618462452
2014	23.414386684009646
2015	22.72992862372649
2016	22.430217391304346
2017	21.984214115889962
2018	21.912072091683303
2019	21.50828874258342