Year	%
2000	29.390149436227002
2001	28.90108909585299
2002	28.496260080216857
2003	28.29485598334239
2004	27.939261506889018
2005	27.641530781222695
2006	27.43265996194134
2007	27.173645650022717
2008	26.959819077304996
2009	26.81469730822807
2010	26.47503820911955
2011	26.221821748506677
2012	25.936757154096853
2013	25.650611881450807
2014	25.272918477357287
2015	24.91809025244067
2016	24.6054640026555
2017	24.29499230717487
2018	24.10019381542329
2019	23.89923247160133