Year	%
2000	31.83581106771516
2001	31.64200157410921
2002	31.936823718568395
2003	31.70434920673769
2004	31.076964288914066
2005	31.05494861017362
2006	29.555344189827427
2007	28.617900313923613
2008	28.263089351698188
2009	27.37433191456733
2010	26.741471261271503
2011	25.588822561988
2012	24.760827936725597
2013	24.07263155994744
2014	24.612815239236483
2015	23.624584927343953
2016	23.60394421115368
2017	22.789777647868345
2018	22.649841724815637
2019	21.998669021360417