Year	%
1993	3.61
1996	4.77
1998	4.77
1999	4.78
2000	5.1
2001	5.16
2003	5.11
2004	4.97
2005	4.94
2006	2.52
2007	2.43
2008	2.36
2009	1.77
2010	1.67
2011	1.64
2012	1.67
2013	1.55
2014	1.44
2015	1.18
2016	0.56
2017	0
2019	0
2021	0