Year	%
1988	5.75
1993	5.68
1995	15.35
1996	14.75
1997	13.89
1998	14.47
1999	12.59
2000	13.48
2001	12.74
2002	12.64
2003	11.56
2004	11.4
2005	11.79
2006	11.63
2007	11.44
2008	10.23
2009	9.77
2010	10.57
2011	10.52
2012	11.52
2013	11.28
2014	11.06
2015	10.59
2016	10.02
2017	9.74
2018	9.45
2019	9.55
2020	11.38
2021	8.77