61% (2009)

61% (2013)

71% (1986)

70% (1981)

56% (1987)

63% (1980)

70% (1984)

66% (2002)

65% (1995)

63% (1997)

71% (1992)

70% (1999)

67% (1996)

60% (2004)

55% (1991)

71% (1990)

73% (1989)

0% (1979)

0% (2001)

60% (1980)