Year	%
1997	9
1998	9
1999	9
2001	9
2002	9
2003	9
2004	10.8695652173913
2005	10.8695652173913
2006	10.8695652173913
2007	10.8695652173913
2008	7.89473684210526
2009	8.26086956521739
2010	8.26086956521739
2011	8.26086956521739
2013	10.9090909090909
2014	10.9090909090909
2015	10.9090909090909
2016	10.9090909090909
2017	12.7272727272727
2018	12.7272727272727
2019	13.0909090909091
2020	13.0909090909091
2021	14.5454545454545
2022	14.5454545454545
2023	14.5454545454545