Year	%
1990	28.07
1992	28.46
1995	29.67
1998	29.71
2000	28.22
2002	29.93
2003	25.53
2004	25.92
2005	13.28
2006	22.99
2008	21.79
2009	21.6
2010	18.13
2011	16.25
2012	15.57
2013	6.69
2015	6.49
2016	10.21