51% (1991)

57% (1989)

57% (1988)

45% (2011)

53% (2004)

53% (1993)

66% (1994)

54% (1997)

51% (2007)

45% (2009)

64% (1986)

56% (1988)

50% (2006)

57% (1991)

50% (1999)

43% (2010)

25% (1985)

44% (2005)

50% (1995)