Year	%
1989	7.82
1993	7.69
1995	6.81
1996	5.52
1997	5.06
1998	3.58
1999	3.32
2000	3.17
2001	3.27
2002	3.31
2003	3.43
2004	3.21
2005	3.17
2006	3.2
2007	3.27
2008	3.22
2009	3.16
2010	2.69
2011	2.65
2012	2.59
2013	2.62
2014	2.59
2015	2.63
2016	2.68
2017	2.71
2018	2.66
2019	4.88
2020	2.63
2021	2.54