Year	%
1990	15.72
1993	17.41
1995	13.93
1996	12.36
1997	10.69
1998	10
1999	10.08
2000	10.45
2001	10.36
2002	9.54
2003	10.19
2004	9.2
2005	10.06
2006	9.83
2007	9.11
2008	8.75
2009	8.69
2010	7.57
2011	9.3
2012	9.72
2013	9.59
2014	9.68
2015	9.68
2016	9.87
2017	10.61
2018	10.42
2019	11
2020	9.95
2021	9.88