63% (1988)

62% (1980)

60% (1986)

57% (1979)

46% (1975)

37% (1986)

54% (1985)

74% (1982)

46% (1980)

0% (1990)

60% (1972)

64% (1978)

61% (1999)

56% (1973)

40% (1985)