Year	%
1993	5.46
1999	4.33
2000	3.49
2001	3.17
2002	2.98
2003	2.8
2004	2.81
2005	2.78
2006	2.9
2007	2.83
2008	3.02
2009	3.44
2011	2.35
2012	2.59
2013	2.39
2014	2.61
2015	2.82
2016	2.85
2017	2.82
2021	1.96