Year	%
1988	23.8
1989	24.69
1990	24.83
1992	25.32
1995	91.27
1996	16.06
1997	16.21
1998	16.21
1999	19.77
2000	19.99
2001	21.47
2002	18.45
2003	20.62
2005	9.34
2006	9.4
2008	9.79
2009	9.83
2010	10.7
2011	10.15
2013	10.07
2014	11.34
2015	8.22
2016	8.52
2020	12.37
2021	12.2