Year	%
1988	7.65
1989	7.76
1990	7.81
1991	7.96
1992	7.83
1993	7.94
1994	8.02
1995	11.43
1996	11.53
1997	11.43
1998	10.9
1999	12.5
2000	16.34
2001	18.22
2002	17.16
2003	16.08
2004	14.59
2005	13.99
2006	13.43
2007	12.58
2008	11.74
2009	11.69
2010	9.55
2011	12.44
2012	10.86
2013	5.02
2014	11.85
2015	9.69
2016	10.78
2017	11.51
2018	12.16
2019	23.69
2020	11.48
2021	10.94