73% (1976)

65% (1995)

65% (1999)

44% (2001)

49% (1995)

58% (2000)

61% (1997)

52% (1988)

45% (2002)

61% (1998)

59% (1990)

40% (1991)

49% (2004)

41% (1987)

49% (2003)

58% (1993)

56% (1993)

49% (1986)

62% (1996)

59% (1987)