Year	%
1989	4.56
1990	4.66
1991	4.73
1992	4.8
1993	4.71
1995	4.27
1996	4.11
1997	3.67
1998	3.6
1999	3.89
2000	3.4
2001	3.46
2002	3.33
2003	3.2
2004	2.99
2005	2.96
2006	2.91
2007	2.42
2008	2.76
2009	2.82
2010	2.81
2011	2.81
2012	2.79
2013	2.81
2014	2.78
2015	2.79
2016	2.79
2017	3.07
2018	3.19
2019	17.94
2020	2.56
2021	2.57