65% (2008)

53% (1996)

61% (1990)

80% (1989)

65% (1970)

0% (1986)

60% (1991)

65% (1997)

39% (2003)

65% (1974)

60% (2001)

68% (2004)

58% (2008)

48% (2005)

53% (1973)

53% (1997)

65% (1971)

72% (2008)

55% (1981)

58% (1998)