55% (1992)

58% (1999)

70% (1986)

62% (1987)

73% (2001)

64% (1970)

70% (2000)

50% (2011)

72% (2009)

68% (1991)

50% (1996)

20% (1999)

54% (1995)

53% (2000)

45% (2001)

0% (1970)