Year	%
1996	12.8
2001	14.1
2002	12
2003	11.7
2004	9.1
2005	16.4
2006	6.4
2007	6.4
2008	5.2
2009	5.8
2010	5.1
2011	4.9
2012	5.1
2013	4.3
2014	4.3
2015	3.7
2016	4.6
2017	4
2018	3.8
2019	3.6
2020	3.2
2021	3.1