Year	%
1993	2.76
1996	2.87
1998	2.64
1999	2.7
2000	2.79
2001	3.08
2003	2.9
2004	2.71
2005	2.53
2006	0.94
2007	0.98
2008	1.06
2009	0.91
2010	1.02
2011	0.98
2012	0.93
2013	0.93
2014	0.86
2015	0.32
2016	0.21
2017	0
2019	0
2021	0