Year	%
1988	19.03
1989	14.98
1990	13.43
1992	11.75
1995	9.07
1996	14.2
1997	13.83
1998	13.97
1999	9.19
2000	13.55
2001	13.61
2002	12.7
2003	12.81
2004	12.09
2005	12.12
2006	12.12
2007	12.25
2008	12.2
2009	11.92
2010	12.12
2011	12.14
2012	13.38
2013	13.39
2014	13.35
2015	13.94
2016	13.94
2017	14.07
2018	14.07
2020	14.07
2021	13.81