Year	%
1992	15.17
1993	10
1996	6.85
1997	6.17
1998	5.06
1999	4.12
2000	3.43
2001	3.86
2002	4.54
2003	5.1
2004	5.64
2005	4.24
2006	4.06
2007	4
2008	2.99
2009	2.71
2010	2.76
2011	3
2012	3.1
2013	2.49
2014	2.29
2015	2.29
2016	2.24
2017	2.24
2019	2.12
2020	2.03
2021	2.02