Year	%
1989	4.2
1990	4.22
1991	4.25
1992	4.25
1993	4.09
1995	3.11
1996	2.95
1997	2.83
1998	3.09
1999	2.12
2000	2.06
2001	2.13
2002	2.21
2003	2.08
2004	1.91
2005	1.87
2006	1.84
2007	1.64
2008	1.78
2009	1.84
2010	1.81
2011	1.79
2012	1.75
2013	1.75
2014	1.75
2015	1.74
2016	1.68
2017	1.57
2018	1.58
2019	2.19
2020	1.55
2021	1.57