Year	%
1994	9.85
1999	12
2001	13.34
2002	13.02
2003	12.23
2004	12.04
2005	11.24
2006	11.36
2007	11.76
2008	7.57
2009	7.53
2010	7.08
2012	6.93
2013	6.5
2014	6.43
2015	6.03
2016	6.14
2017	6.24
2018	6.02
2019	5.41
2020	5.31
2021	3.96