Year	%
1989	5.78
1990	5.68
1991	5.8
1992	5.72
1993	5.59
1995	4.89
1996	4.67
1997	4.53
1998	4.64
1999	4.01
2000	4.02
2001	3.94
2002	4.11
2003	3.63
2004	3.4
2005	3.33
2006	3.23
2007	3.04
2008	3.21
2009	3.09
2010	3.07
2011	3.11
2012	3.09
2013	2.96
2014	3.02
2015	2.88
2016	2.83
2017	2.77
2018	2.77
2019	3.11
2020	2.92
2021	2.84