0% (1970)

60% (1993)

52% (1999)

54% (1988)

61% (2006)

67% (1999)

62% (2000)

62% (1979)

63% (2007)

47% (1983)

51% (1994)

39% (1993)

58% (1993)

39% (1993)

50% (2000)

55% (2013)

67% (2007)

38% (2009)

47% (1992)

67% (1994)