Year	%
1988	33.01
1989	33.35
1990	33.53
1992	33.04
1995	92.88
1996	26.19
1997	26.22
1998	26.22
1999	27.43
2000	28.51
2001	28.8
2002	37.61
2003	32.8
2005	12.83
2006	12.79
2008	12.06
2009	11.95
2010	12.78
2011	12.66
2013	13.15
2014	13.28
2015	12.57
2016	12.57
2020	15.82
2021	15.34