Year	%
1990	14.1141141141141
1991	13.8297872340426
1992	13.7254901960784
1993	13.6741479634248
1994	13.7875659554944
1995	14.1093011035208
1996	14.7518749002713
1997	15.8090706934892
1998	17.1303022786066
1999	18.2960997743671
2000	18.7455764888275
2001	18.6943753222588
2002	19.5024686669199
2003	21.1432102205611
2004	22.8908554572271
2005	24.5127664320915
2006	26.0460945456062
2007	27.5287488324376
2008	28.8848626244074
2009	30.0722053505047
2010	31.1231567589786
2011	32.050907894015
2012	32.8932066403175
2013	33.6923900099772
2014	34.445909334002
2015	35.1344539108618
2016	35.7102365679762
2017	36.1643504257675
2018	36.5343538793632
2019	36.8131557098649
2020	36.9881759730169
2021	37.0516100539857
2022	36.9967460024094