Year	%
1990	25.87
1992	19.29
1993	12.55
1994	10.72
1995	21.21
1996	35.63
1997	14.16
1998	18.83
1999	13.33
2000	14.33
2001	12.48
2002	14.05
2003	11.2
2004	8.24
2005	5.8
2006	6.47
2007	5.2
2008	6.08
2009	5.44
2010	8.59
2011	6.24
2012	4.28
2013	4.08
2014	3.83
2015	4.08
2016	4.06
2017	4.86