55% (1989)

45% (2011)

57% (1988)

51% (2007)

59% (1991)

51% (1991)

51% (2004)

52% (1993)

56% (1988)

64% (1986)

67% (1994)

45% (2009)

54% (1997)

44% (2010)

45% (2005)

50% (2006)

43% (1999)

50% (1995)

25% (1985)