Year	%
1990	28.77
1992	28.76
1995	29.86
1998	31.29
2000	52.53
2002	55.87
2003	49.07
2004	46.75
2005	44.79
2006	45.72
2008	29.97
2009	26.26
2010	18.43
2011	23.35
2012	24.51
2013	19.47
2015	19.51
2016	22.75