Year	Percent
1990	1.2
1995	12.4
1997	10.6
1999	10.2
2001	8.9
2002	13.2
2003	8.3
2004	5.7
2005	6.1
2006	7.9
2007	7.8
2008	4.3
2009	5.8
2010	5.5
2011	5
2012	3.3
2013	1.8
2014	2.4
2015	1.9
2016	1.7