Year	%
1990	15.4929577464789
1991	15.5172413793104
1992	15.8102766798419
1993	15.8273381294964
1994	16.1184210526316
1995	15.9509202453988
1996	16.0112359550562
1997	16.243654822335
1998	16.4383561643836
1999	16.4948453608247
2000	16.4794007490637
2001	16.271186440678
2002	15.919629057187
2003	15.7001414427157
2004	15.5149934810952
2005	15.1990349819059
2006	14.9606299212598
2007	14.6469968387777
2008	14.3422354104847
2009	13.9664804469274
2010	13.556338028169
2011	13.1996658312448
2012	12.8082736674622
2013	12.4620060790274
2014	12.0815138282387
2015	11.6783216783217
2016	11.2382234185733
2017	10.8441558441558
2018	10.4899497487437
2019	10.1034692635423
2020	9.75177304964539
2021	9.48821161587119
2022	9.31919642857143