Year	%
1990	22.1945464079706
1991	22.451989355904
1992	22.751724574394
1993	23.0167948516716
1994	23.2855712676761
1995	23.5588815480477
1996	23.672750857037
1997	23.6650157586673
1998	23.6288515813669
1999	23.555580583399
2000	23.4477502245692
2001	23.3447368421053
2002	23.2635452353762
2003	23.17897004112
2004	23.110509954676
2005	23.0682133284037
2006	23.0564273940434
2007	23.0745417154988
2008	23.1236442516269
2009	23.215832048493
2010	23.3245122776786
2011	23.4387834832609
2012	23.5663662956201
2013	23.692584924469
2014	23.8211640014182
2015	23.9417436940454
2016	24.049917921381
2017	24.1466845048197
2018	24.2380841354961
2019	24.385059709242
2020	24.6450255772816
2021	24.822950614189
2022	24.9784323391669