Year	%
1988	34.38
1989	36.03
1990	36.16
1992	35.24
1995	62.19
1996	23.86
1997	23.88
1998	23.88
1999	25.74
2000	25.74
2001	25.75
2002	27.32
2003	25.67
2005	11.66
2006	11.75
2008	11.86
2009	10.83
2010	11.51
2011	11.52
2013	11.5
2014	11.76
2015	11.66
2016	11.76
2020	11.79
2021	11.79