72% (1990)

35% (1985)

58% (2002)

47% (2002)

48% (1975)

58% (1966)

60% (1970)

50% (1976)

44% (1986)

46% (1983)

58% (1975)

35% (1985)

0% (1980)

0% (1997)

55% (1980)

61% (1969)

62% (1976)

53% (2006)

43% (1981)

43% (1977)