48% (1996)

45% (1994)

65% (1984)

70% (2010)

30% (2000)

50% (1976)

47% (1998)

68% (1989)

43% (1999)

40% (1982)

70% (1980)

55% (2001)

61% (1988)

51% (1979)

62% (1981)

65% (1986)

64% (1992)

61% (1997)

56% (2008)

60% (1977)