Year	%
1991	11.85
1994	8.02
1995	6.35
1996	10.45
1997	9.46
1998	11.46
1999	6.2
2000	10.25
2001	10.74
2002	9.94
2003	9.85
2004	5.12
2005	4.61
2006	2.4
2007	3.34
2008	3.59
2009	3.45
2010	3.95
2011	4.27
2012	4.18
2013	4.42
2014	4.2
2015	4.43
2016	4.21
2017	4.8
2018	4.98
2019	4.98
2020	4.05
2021	4.49