50% (2011)

76% (2005)

65% (2009)

80% (2004)

20% (2002)

75% (2014)

50% (1996)

70% (2013)

70% (2008)

87% (1997)

70% (1995)

70% (2013)

55% (1990)

80% (1999)

50% (1992)