75% (1989)

68% (2007)

64% (2008)

70% (1990)

73% (2002)

67% (2006)

52% (2003)

73% (1987)

30% (1997)

68% (1989)

100% (1996)

70% (2005)

71% (1988)

71% (1992)

63% (1996)

60% (1990)

76% (1999)

65% (1983)

70% (1993)

66% (2005)