Year	%
1991	7.52
1992	10.62
1994	12.08
1995	11.45
1996	12.4
1997	12.34
1998	12.93
1999	13.21
2000	12.69
2001	13.06
2002	12.99
2003	12.75
2004	10.26
2005	9.52
2006	7.89
2007	8.2
2008	8.4
2009	7.57
2010	8.3
2011	5.27
2012	3.9
2013	4.22
2014	3.83
2015	8.46
2016	8.81
2017	4.05
2018	3.22
2019	2.82
2020	2.22
2021	2.29