Year	%
2001	2.33
2002	1.99
2003	2.04
2004	2.5
2005	2.19
2006	2.39
2007	2.29
2008	2.24
2009	2.31
2010	1.4
2011	1.86
2012	1.79
2013	1.94
2015	1.84
2017	2.34
2018	2.61