Year	%
1992	11.24
1993	9.09
1996	6.53
1997	5.64
1998	4.69
1999	4.06
2000	3.09
2001	4.67
2002	4.99
2003	5.57
2004	5.4
2005	5.08
2006	5.17
2007	3.54
2008	2.4
2009	2.29
2010	6.26
2011	2.13
2012	2.36
2013	2.41
2014	2.39
2015	2.56
2016	2.72
2017	2.8
2019	2.63
2020	2.52
2021	2.67