Year	%
1990	25.08
1992	25.32
1995	28.68
1998	30.13
2000	41.38
2002	44.04
2003	38.16
2004	37.85
2005	26.63
2006	32.23
2008	26.74
2009	25.05
2010	17.86
2011	22.34
2012	22.14
2013	12.27
2015	11.86
2016	19.53