Year	%
1988	31.03
1989	33.13
1990	33.15
1992	31.38
1995	98.31
1996	26.02
1997	26.03
1998	26.03
1999	26.9
2000	26.9
2001	27.1
2002	39.09
2003	37.89
2005	12.61
2006	12.58
2008	12.36
2009	12.33
2010	12.35
2011	12.34
2013	12.36
2014	12.47
2015	13.2
2016	13.2
2020	13.26
2021	13.26