Year	%
1993	5.13
1996	2.87
1998	2.74
1999	2.79
2000	2.87
2001	3.16
2003	2.97
2004	2.78
2005	2.6
2006	2.36
2007	2.49
2008	2.62
2009	2.66
2010	2.7
2011	2.53
2012	2.39
2013	2.56
2014	2.47
2015	2.35
2016	1.72
2017	0
2019	0
2021	0