Year	%
2000	27.778378365910402
2001	27.422235718331308
2002	27.223974776644575
2003	27.093764027572465
2004	27.16586605448391
2005	26.639607414344304
2006	25.78736598893827
2007	25.340173740070554
2008	25.186919892234805
2009	25.05456742879782
2010	24.946779894438862
2011	24.796563729181717
2012	24.589854299975197
2013	24.19217648304872
2014	23.65956522539021
2015	23.403065958228424
2016	23.182929535725837
2017	22.709472627415195
2018	22.40396768426959
2019	22.232731512170453