Year	%
1996	5.94
1997	6.03
1998	5.99
1999	6.05
2000	5.94
2001	5.82
2002	6.32
2003	5.79
2004	5.58
2005	5.67
2006	5.42
2008	4.56
2009	4.7
2011	4.72
2012	4.99
2013	4.77
2014	4.9
2015	4.4
2016	4.47
2017	4.5
2018	4.51
2019	4.35
2020	3.98
2021	4.61