Year	%
2000	22.1794285253883
2001	21.903244102613566
2002	21.897113389414645
2003	21.84974653323053
2004	21.721835052042465
2005	21.218858669709974
2006	20.473973267273074
2007	19.985324552009125
2008	19.69766693721997
2009	19.47313768630011
2010	19.24525113430891
2011	19.004296290635338
2012	18.710601552684317
2013	18.270939790980496
2014	17.91475341740908
2015	17.662609835793997
2016	17.52964721365749
2017	17.28408010313791
2018	17.056145708132444
2019	16.968421044782918