Year	%
1989	31.64
1990	23.27
1991	19
1992	20.37
1993	9.06
1994	8.66
1995	9.02
1996	10.34
1997	10.26
1998	12.9
1999	11.22
2000	12.23
2001	11.74
2002	10.86
2003	10.83
2004	9.13
2005	7.97
2006	7.77
2007	7.83
2008	7.89
2009	8.04
2010	7.95
2011	8.18
2012	8.36
2013	9.77
2014	8.5
2015	8.6
2016	8.49
2017	8.54
2018	8.54
2019	8.48
2020	8.58
2021	8.41