Year	%
1988	6.71
1990	6.5
1991	7.18
1993	8.44
1996	7.75
1997	7.09
1999	7.01
2000	7.15
2001	6.96
2002	6.87
2003	6.76
2004	6.06
2005	6.46
2006	6.48
2007	6.52
2008	6.37
2009	6
2010	6.24
2011	6.22
2012	6.23
2013	6.15
2014	6.02
2015	6.17
2016	6.24
2017	6.22
2018	6.23
2019	10.82
2020	6.12
2021	6.37