Year	%
1988	33.68
1989	35.54
1990	35.65
1992	34.42
1995	70.58
1996	24.4
1997	24.41
1998	24.41
1999	26.05
2000	26.05
2001	26.1
2002	29.99
2003	28.46
2005	11.9
2006	11.96
2008	12
2009	11.19
2010	11.72
2011	11.72
2013	11.71
2014	11.93
2015	12.06
2016	12.13
2020	12.17
2021	12.17