Year	%
1997	7.07070707070707
1998	7.07070707070707
1999	12.1212121212121
2000	12.1212121212121
2001	12.1212121212121
2002	12.1212121212121
2003	12.1212121212121
2004	12.1212121212121
2005	11.1111111111111
2006	11.1111111111111
2007	12.1212121212121
2008	12.1212121212121
2009	14.1414141414141
2010	15.1515151515152
2011	12.1212121212121
2012	12.1212121212121
2013	12.1212121212121
2014	13.1313131313131
2015	16.1616161616162
2016	16.1616161616162
2017	20.2020202020202
2018	20.2020202020202
2019	19.1919191919192
2020	21.2121212121212
2021	24.2424242424242
2022	25.2525252525253
2023	26.2626262626263