Year	%
1989	32.72
1990	28.51
1993	18.62
1995	16.24
1996	12.37
1997	23.95
1998	9.61
1999	11.18
2000	8.97
2001	7
2002	7.03
2003	7.03
2004	7.13
2005	7.13
2006	7.13
2007	7.03
2008	7.02
2009	6.9
2010	7.27
2011	7.27
2012	7.23
2013	7.23
2016	8.29
2017	8.56
2018	8.56
2019	8.56
2020	8.56
2021	8.56