Year	%
1992	36.02
1993	33.32
1994	31.8
1996	26.14
1997	18.43
1998	18.36
1999	18.16
2000	18.87
2001	17.81
2002	13.66
2003	12.53
2004	11.69
2005	10.72
2006	11.1
2007	11.2
2008	10.96
2009	10.96
2010	11
2011	10.95
2014	10.41
2015	10.44
2016	10.76
2017	10.82
2018	10.82
2019	9.24
2020	9.25
2021	9.26