Year	%
1993	18.17
1995	16.27
1997	14.24
1998	14.25
1999	14.15
2000	15.54
2001	12.58
2002	12.58
2003	12.4
2004	11.04
2005	10.74
2006	9.22
2007	9.09
2008	5.66
2009	3.49
2010	3.7
2011	1.83
2013	1.8
2014	1.75
2015	1.76
2017	0.54
2018	0.44
2019	0.41
2020	0.36
2021	0.37