Year	%
1988	5.87
1989	6.23
1990	6.78
1991	6.57
1992	6.61
1993	5.52
1994	5.55
1995	13.06
1996	11.09
1997	9.61
1998	9.21
1999	9.51
2000	7.93
2001	9.87
2002	6.42
2003	6.54
2004	6.85
2005	7.36
2006	7.24
2007	6.51
2008	5.94
2009	6.25
2010	6.3
2011	5.84
2012	5.6
2013	5.38
2014	5.72
2015	5.69
2016	5.32
2017	5.16
2018	5.24
2019	5.87
2020	2.21
2021	4.81