Year	%
1991	7.12
1992	11.79
1994	12.22
1995	12.35
1996	12.84
1997	12.91
1998	13.29
1999	13.21
2000	13.11
2001	13.01
2002	12.94
2003	12.83
2004	11.37
2005	11.55
2006	10
2007	9.8
2008	9.85
2009	9.71
2010	10.8
2011	7.46
2012	6.93
2013	7.41
2014	6.7
2015	9.43
2016	8.96
2017	4.58
2018	3.79
2019	3.72
2020	3.5
2021	3.39