62% (2003)

54% (2001)

47% (2002)

44% (1987)

58% (2003)

29% (2009)

51% (2008)

38% (2003)

55% (1987)

63% (2007)

54% (1998)

55% (1992)

58% (1993)

50% (2006)

64% (2007)

63% (1990)

37% (1999)

42% (2010)

56% (1983)

53% (2012)