Year	%
1989	6.39
1990	6.39
1991	6.37
1992	6.39
1993	6.4
1995	5.73
1996	5.42
1997	5.19
1998	4.71
1999	4.34
2000	4.31
2001	4.19
2002	4.1
2003	3.96
2004	3.82
2005	3.8
2006	3.79
2007	3.65
2008	3.84
2009	3.88
2010	3.9
2011	3.89
2012	3.79
2013	3.78
2014	3.77
2015	3.78
2016	3.78
2017	3.53
2018	3.76
2019	4.15
2020	3.7
2021	3.79