Year	%
1990	29
1992	29.04
1995	29.43
1998	28.68
2000	25.61
2002	27.56
2003	22.56
2004	22.86
2005	21.67
2006	21.32
2008	19
2009	19.32
2010	15.89
2011	13.74
2012	12.34
2013	12.16
2015	12.16
2016	7.65