Year	%
1997	8
1998	8
1999	8
2001	8.52017937219731
2002	8.52017937219731
2003	8.52017937219731
2004	8.52017937219731
2005	8.52017937219731
2006	8.52017937219731
2007	8.86699507389163
2008	8.86699507389163
2009	8.86699507389163
2010	8.86699507389163
2011	11.0236220472441
2012	10.4417670682731
2013	10.4417670682731
2014	9.44881889763779
2015	9.16334661354582
2016	9.16334661354582
2017	10.5882352941176
2018	10.5882352941176
2019	10.9803921568627
2020	11.3725490196078
2021	14.1732283464567
2022	14.1732283464567
2023	13.7254901960784