Year	%
1988	6.9
1989	7
1990	7.36
1991	7.27
1992	7.33
1993	7.13
1994	7.27
1995	17.54
1996	16.3
1997	15.76
1998	14.19
1999	14.06
2000	12
2001	13.08
2002	10.97
2003	11.18
2004	11.34
2005	11.98
2006	11.87
2007	10.85
2008	10.4
2009	10.3
2010	10.37
2011	10.39
2012	10.42
2013	10.24
2014	10.26
2015	10.28
2016	10.31
2017	10.03
2018	9.99
2019	12.26
2020	5.58
2021	10.21