Year	%
1991	6.22
1992	10.46
1994	11.53
1995	12.22
1996	10.87
1997	11.05
1998	10.74
1999	10.03
2000	10.56
2001	10.32
2002	10.87
2003	10.63
2004	10.98
2005	11.17
2006	11.71
2007	11.99
2008	11.32
2009	10.59
2010	11.54
2011	8.7
2012	7.43
2013	7.04
2014	6.78
2015	5.95
2016	6.35
2017	8.76
2018	6.77
2019	6.57
2020	5.7
2021	5.26