Year	%
1990	23.8823529411765
1991	24.2224316682375
1992	24.5495495495496
1993	24.8932275777913
1994	25.3421186011151
1995	25.8050478677111
1996	26.295585412668
1997	26.6968325791855
1998	27.0754716981132
1999	27.3369104772663
2000	27.4610074149834
2001	27.5034610059991
2002	27.5470138458359
2003	27.6160060116476
2004	27.7487821851079
2005	27.9462383215866
2006	28.2043295436848
2007	28.4650885812119
2008	28.6861732644865
2009	28.8386917960089
2010	28.8681757656458
2011	28.8351368555061
2012	28.7495460597991
2013	28.6753666705162
2014	28.6549707602339
2015	28.6895674300254
2016	28.8410256410256
2017	28.9618031315448
2018	28.9957430340557
2019	29.0687880205896
2020	29.1522648717482
2021	29.2310408757835
2022	29.3134328358209