Year	%
1990	22.2222222222222
1991	22.4489795918367
1992	23.0769230769231
1993	23.6363636363636
1994	23.728813559322
1995	24.1935483870968
1996	26.1538461538462
1997	26.4705882352941
1998	27.027027027027
1999	28.0487804878049
2000	28.5714285714286
2001	29
2002	29.3577981651376
2003	29.6610169491525
2004	29.6875
2005	29.5774647887324
2006	29.2993630573248
2007	29.4117647058824
2008	30
2009	31.1827956989247
2010	31.2820512820513
2011	31.7073170731707
2012	31.6279069767442
2013	31.5789473684211
2014	31.6666666666667
2015	31.6205533596838
2016	30.8550185873606
2017	30.3448275862069
2018	29.7734627831715
2019	29.1411042944785
2020	28.8235294117647
2021	28.2485875706215
2022	27.7173913043478