Year	%
1993	9.53
1995	8.65
1996	6.05
1997	5.88
1998	5.62
1999	6.64
2000	5
2001	4.75
2002	4.64
2003	4.5
2004	4.29
2005	4.29
2006	4.31
2007	4.26
2008	4.3
2009	4.37
2010	4.35
2011	4.29
2013	4.36
2015	4.39
2016	4.39
2017	4.42
2018	4.41
2019	4.42
2020	4.44
2021	4.46