Year	%
1999	8.38
2000	8.31
2001	8.34
2002	5.07
2003	5.01
2004	5.01
2005	4.31
2006	4.22
2007	3.81
2008	3.8
2009	3.83
2010	4.69
2011	3.85
2012	3.85
2013	4.11
2014	3.87
2015	3.77
2016	3.75
2017	3.93
2018	3.36
2019	3.77
2020	3.76
2021	3.77