60% (1991)

62% (1994)

51% (1996)

55% (1987)

62% (1987)

59% (1982)

49% (1990)

56% (1989)

51% (1985)

47% (1999)

62% (1980)

53% (1981)

47% (1986)

62% (1994)

49% (1998)

68% (1988)

47% (1980)

0% (1995)

52% (1986)

50% (1984)