Year	%
1990	23.5294117647059
1991	25
1992	28.5714285714286
1993	32
1994	31.25
1995	35.7142857142857
1996	36.8421052631579
1997	38.5542168674699
1998	39.344262295082
1999	39.8876404494382
2000	40.3162055335968
2001	40.4069767441861
2002	40.4063205417607
2003	40.2193784277879
2004	39.9691358024691
2005	40.0544959128065
2006	40.4761904761905
2007	40.8284023668639
2008	41.1831626848692
2009	41.5094339622641
2010	41.8579234972678
2011	42.2993492407809
2012	42.7645788336933
2013	43.1034482758621
2014	43.5952637244349
2015	43.8370846730975
2016	44.136460554371
2017	44.2468619246862
2018	44.3762781186094
2019	44.4555444555445
2020	44.5853658536585
2021	44.6768060836502
2022	44.8148148148148