58% (1987)

61% (1999)

53% (2005)

52% (2008)

49% (2004)

60% (1982)

35% (2003)

65% (1991)

64% (1997)

59% (1993)

62% (1997)

55% (1998)

58% (2006)

47% (2012)

55% (1985)

59% (2003)

44% (1998)

60% (1997)

0% (2005)

43% (2010)