59% (2000)

55% (1999)

67% (1995)

68% (1987)

74% (1995)

51% (2002)

64% (2001)

59% (1991)

52% (1998)

39% (1994)

43% (1998)

70% (1990)

70% (1989)

59% (1989)

56% (1997)

0% (1994)

0% (1997)

0% (1970)

0% (1997)

0% (1995)