43% (1994)

35% (1996)

32% (1993)

49% (1984)

30% (2003)

53% (1983)

49% (2007)

32% (1992)

71% (1971)

38% (1980)

10% (1979)

55% (2000)

65% (1973)

70% (1981)

66% (1979)

30% (1992)

42% (1986)

44% (1997)

20% (2006)

20% (1996)