Year	%
1990	34.7826086956522
1991	35.7142857142857
1992	37.1428571428572
1993	39.5348837209302
1994	40.3846153846154
1995	40.3225806451613
1996	41.0958904109589
1997	41.1764705882353
1998	41.8367346938776
1999	42.4778761061947
2000	43.0769230769231
2001	43.2432432432432
2002	43.7869822485207
2003	44.3298969072165
2004	44.3946188340807
2005	44.7470817120622
2006	44.5578231292517
2007	44.7761194029851
2008	44.973544973545
2009	45.0704225352113
2010	45.2479338842975
2011	45.4379562043796
2012	45.5429497568882
2013	45.7308248914617
2014	45.7846952010376
2015	45.8429561200924
2016	45.9958932238193
2017	46.2031107044831
2018	46.2857142857143
2019	46.4285714285714
2020	46.4124111182935
2021	46.3834672789897
2022	46.3576158940397