Year	%
1991	5.86
1992	12.04
1994	12.51
1995	13.96
1996	12.17
1997	12.3
1998	12.28
1999	12.38
2000	12.73
2001	12.77
2002	12.79
2003	12.74
2004	11.76
2005	11.94
2006	11.33
2007	10.88
2008	10.86
2009	10.77
2010	11.28
2011	6.72
2012	5.39
2013	5.49
2014	4.99
2015	4.51
2016	4.6
2017	4.37
2018	3.14
2019	2.76
2020	2.42
2021	3.17