Year	%
1990	27.1050521251002
1991	26.6284896206156
1992	26.1203585147247
1993	25.6748994830557
1994	25.154958677686
1995	24.6390312063344
1996	24.1263157894737
1997	23.6349751813669
1998	23.125
1999	22.6164079822616
2000	22.1777650757359
2001	21.8191108840061
2002	21.4760485904194
2003	21.1145510835913
2004	20.7874603470797
2005	20.4741744284505
2006	20.1696222050887
2007	19.8647506339814
2008	19.5868302130407
2009	19.3042858838893
2010	18.9209809264305
2011	18.4392196098049
2012	17.9612998796408
2013	17.5253268681271
2014	17.1234557800867
2015	16.7146525562213
2016	16.3942950527411
2017	16.1111111111111
2018	15.8287671232877
2019	15.529303062302
2020	15.2083732210096
2021	14.9699857664459
2022	14.7614761476148