Year	%
1988	13.94
1989	10.61
1990	9.54
1992	8.53
1995	6.84
1996	15.02
1997	13.45
1998	13.61
1999	5.9
2000	9.55
2001	10.41
2002	9.98
2003	9.72
2004	9.27
2005	7.97
2006	7.46
2007	7.41
2008	8.37
2009	7.89
2010	7.31
2011	7.45
2012	7.72
2013	7.99
2014	7.99
2015	8.42
2016	8.83
2017	9.07
2018	9.07
2020	10.42
2021	8.9