75% (1974)

60% (1975)

76% (1969)

60% (1973)

63% (1974)

56% (1975)

48% (1973)

58% (1996)

50% (1969)

50% (1977)

46% (1973)

59% (1968)

42% (1988)

62% (1977)

48% (1983)

53% (1974)

59% (1970)

37% (1997)

30% (1974)

43% (1999)