Year	%
1989	5.28
1990	5.2
1991	5.31
1992	5.25
1993	5.12
1995	4.59
1996	4.44
1997	4.34
1998	4.49
1999	3.88
2000	3.87
2001	3.82
2002	3.98
2003	3.53
2004	3.31
2005	3.23
2006	3.14
2007	3.01
2008	3.1
2009	3
2010	2.96
2011	3.03
2012	2.99
2013	2.87
2014	2.93
2015	2.8
2016	2.76
2017	3.36
2018	3.25
2019	8.7
2020	2.87
2021	2.79