Year	%
1992	12.09
1993	8.91
1996	7.31
1997	6.26
1998	5.25
1999	4.47
2000	3.56
2001	4.48
2002	4.9
2003	5.52
2004	5.41
2005	4.38
2006	4.22
2007	4.34
2008	3.05
2009	2.69
2010	3.02
2011	2.66
2012	2.94
2013	2.99
2014	2.9
2015	2.96
2016	3.1
2017	3.16
2019	3.01
2020	2.79
2021	2.94