Year	%
1992	5.13
1997	4.9
2001	5
2002	7.19
2003	4.92
2004	4.92
2005	4.92
2006	4.87
2007	4.72
2008	4.72
2009	4.72
2012	4.63
2013	4.63
2014	4.63
2015	4.72
2016	4.72
2017	4.73
2018	4.73
2019	4.74
2020	4.73
2021	4.73