Year	Percent
1985	3.2
1986	4.7
1987	5.8
1988	6
1989	8.66
2001	4.12
2003	7.6
2004	6.41
2005	5.37
2006	5.31
2007	4.89
2008	6.2
2009	8.16
2010	7.83
2012	5.21
2013	5.28
2014	4.52
2015	4.7
2016	3.9
2017	3.3
2018	5.2