Year	%
1989	17.57
1990	16.56
1993	15.61
1995	12.41
1996	12.32
1997	17.76
1998	6.71
1999	11.3
2000	6.62
2001	6.59
2002	6.56
2003	6.53
2004	6.52
2005	6.51
2006	6.5
2007	6.66
2008	6.65
2009	6.62
2010	7.86
2011	7.96
2012	7.86
2013	7.25
2016	6.77
2017	6.87
2018	7.03
2019	9.07
2020	6.85
2021	6.85