Year	%
2000	28.758019138054863
2001	28.771731327928027
2002	28.44589851011955
2003	28.133514327380695
2004	27.896894372976448
2005	27.2202345308825
2006	26.4838184987188
2007	26.06620425268151
2008	25.14466483541623
2009	24.565286897770402
2010	23.79512736309234
2011	23.32862200128331
2012	22.863133967977372
2013	22.333412161162432
2014	22.174290456361476
2015	21.77006688241788
2016	21.552676470666515
2017	21.352836266783008
2018	21.292374380700306
2019	20.985414018121617