Year	%
1997	9.09090909090909
1998	9.09090909090909
1999	9.09090909090909
2000	9.09090909090909
2002	2
2003	2
2004	2
2005	14.7826086956522
2006	15.0724637681159
2008	6.33333333333333
2009	18.5507246376812
2010	18.5507246376812
2011	19.7142857142857
2012	19.7142857142857
2013	19.7142857142857
2014	19.8275862068966
2015	20
2016	20
2017	20.2857142857143
2018	20.2857142857143
2019	20.6303724928367
2020	20.9169054441261
2021	20.8571428571429
2022	20.8571428571429
2023	20.8571428571429