Year	%
2000	4.26739225977071
2001	4.22288063051334
2002	4.23108892573516
2003	4.1819210070692
2004	4.11304654909595
2005	4.06397406819179
2006	3.96989554178102
2007	4.03312749392072
2008	3.98908675680437
2009	3.88734745898666
2010	3.88415747056839
2011	3.7883206942423
2012	3.85302079645403
2013	3.79430374673224
2014	3.73104064937913
2015	3.76117253718418
2016	3.66826136039322
2017	3.72307817362059
2018	3.38073412792908
2019	3.37057415801372
2020	3.41527189289153