Year	%
1990	9.79591836734694
1991	9.85401459854015
1992	9.86842105263158
1993	9.88023952095808
1994	10.1648351648352
1995	10.5196451204056
1996	11.1633372502938
1997	11.8421052631579
1998	12.5256673511294
1999	13.4299516908213
2000	14.207650273224
2001	15.819209039548
2002	16.4513936097893
2003	17.04619388419
2004	17.606943583385
2005	18.1872037914692
2006	18.7535410764872
2007	19.3286410395236
2008	19.7219361483007
2009	20.1565557729941
2010	20.5498602050326
2011	20.7890070921986
2012	20.9819555182543
2013	21.2875197472354
2014	21.5620328849028
2015	21.7623974313236
2016	21.8601493550577
2017	21.8831168831169
2018	21.8740304064536
2019	21.7830609212481
2020	21.8066743383199
2021	21.912013536379
2022	22.4687933425798