Year	%
1997	15
1998	15
1999	15
2000	15
2001	15
2003	20
2004	20
2005	20
2006	20
2007	12.1951219512195
2008	12.1951219512195
2009	12.1951219512195
2010	12.1951219512195
2011	12.1951219512195
2012	13.1578947368421
2013	13.1578947368421
2014	13.1578947368421
2015	13.1578947368421
2016	13.1578947368421
2017	12.8205128205128
2018	12.8205128205128
2019	12.8205128205128
2020	12.8205128205128
2021	17.9487179487179
2022	17.9487179487179
2023	17.9487179487179