Year	Percent
1990	5.41
1991	5.38
1992	5.38
1993	5.37
1994	5.35
1995	5.3
1996	5.31
1997	5.3
1998	5.33
1999	5.33
2000	5.32
2001	5.32
2002	5.31
2003	5.28
2004	5.26
2005	5.26
2006	5.25
2007	5.25
2008	5.28
2009	5.29
2010	5.27
2011	5.27
2012	5.27
2013	5.27
2014	5.27
2015	5.27
2016	5.27
2017	5.26
2018	5.25
2019	5.25