Year	%
2000	23.896425876149337
2001	23.603724081708528
2002	23.384426945126034
2003	23.203352412341253
2004	22.98556797643596
2005	22.802241432073757
2006	22.66823328733992
2007	22.53765648036904
2008	22.38412322768333
2009	22.256669841303314
2010	22.154090132414154
2011	22.144021842582138
2012	22.18270626917189
2013	22.245918561350546
2014	22.31937938358775
2015	22.392106949138
2016	22.529065139583913
2017	22.636278349299666
2018	22.739436866506335
2019	22.828261923849247