66% (1993)

40% (2003)

67% (1979)

61% (1982)

73% (1999)

72% (2009)

56% (1990)

40% (1989)

71% (1972)

70% (2000)

72% (1992)

52% (2002)

64% (2000)

59% (1977)

53% (2005)

50% (1995)

43% (2001)

57% (1993)

70% (2003)

73% (2000)