Year	%
1990	28.33
1992	28.75
1995	29.77
1998	29.67
2000	27.09
2002	28.73
2003	24.48
2004	24.9
2005	12.1
2006	22.16
2008	21.32
2009	21.27
2010	18.15
2011	15.69
2012	14.94
2013	6.16
2015	5.97
2016	9.32