Year	%
1988	7.14
1989	7.33
1990	7.44
1991	7.49
1992	7.37
1993	7.41
1994	7.61
1995	9.58
1996	9.82
1997	11.47
1998	11.27
1999	11.79
2000	14.3
2001	14.75
2002	14.87
2003	14.42
2004	13.69
2005	13.29
2006	12.63
2007	11.49
2008	10.82
2009	10.93
2010	9.36
2011	11.32
2012	10.71
2013	4.77
2014	11.4
2015	10.57
2016	10.81
2017	12.02
2018	12.53
2019	29.84
2020	8.34
2021	7.7