Year	%
1988	18.83
1989	14.89
1990	12.98
1992	11.18
1995	8.27
1996	9.83
1997	9.72
1998	10.25
1999	8.54
2000	9.84
2001	9.91
2002	9.58
2003	9.49
2004	9.12
2005	9.12
2006	9.2
2007	8.36
2008	9.76
2009	9.97
2010	10.12
2011	10.36
2012	10.18
2013	10.33
2014	5.98
2015	6.05
2016	11.12
2017	5.36
2018	5.23
2020	5.29
2021	5