Year	%
1997	13.0434782608696
1998	13.0434782608696
1999	18.695652173913
2000	17.3913043478261
2001	18.695652173913
2002	19.1304347826087
2003	19.1304347826087
2004	19.1304347826087
2005	21.304347826087
2006	21.304347826087
2007	28.2608695652174
2008	28.2608695652174
2009	27.3913043478261
2010	27.3913043478261
2011	28.695652173913
2012	28.695652173913
2013	31.304347826087
2014	31.304347826087
2015	34.7826086956522
2016	34.7826086956522
2017	34.7826086956522
2018	34.7826086956522
2019	38.695652173913
2020	40
2021	40
2022	36.9565217391304
2023	36.0869565217391