Year	%
1988	13.76
1990	11.41
1991	12.3
1993	14.23
1996	9.16
1997	7.01
1999	6.13
2000	6.23
2001	6.16
2002	5.86
2003	6.14
2004	6.72
2005	7.36
2006	7.38
2007	7.02
2008	6.19
2009	6.83
2010	7.06
2011	7.05
2012	7.06
2013	7.28
2014	7.19
2015	7.27
2016	7.29
2017	7.47
2018	7.5
2019	7.63
2020	7.02
2021	7.06