Year	%
1997	7.28862973760933
1998	7.28862973760933
1999	7.28862973760933
2001	10.7246376811594
2002	10.7246376811594
2003	10.7246376811594
2004	11.4457831325301
2005	11.178247734139
2006	11.178247734139
2007	9.39393939393939
2008	11.377245508982
2009	11.377245508982
2010	11.377245508982
2011	11.2121212121212
2012	13.3495145631068
2013	13.3495145631068
2014	13.5135135135135
2015	13.715710723192
2016	13.715710723192
2017	20.6686930091185
2018	20.6686930091185
2019	21.8844984802432
2020	21.8844984802432
2021	18.5410334346505
2022	19.0909090909091
2023	19.0909090909091