61% (2008)

60% (2009)

64% (2001)

10% (1990)

56% (1982)

68% (1991)

61% (1973)

54% (1982)

56% (2004)

62% (2006)

60% (2004)

60% (2004)

70% (1992)

66% (1987)

68% (1993)

41% (1994)

53% (2010)

66% (2006)

43% (2007)

48% (1986)