51% (2005)

49% (2003)

40% (1979)

58% (1980)

56% (1999)

56% (2001)

71% (1977)

50% (1997)

62% (1983)

59% (2008)

42% (1998)

52% (2002)

61% (2018)

53% (1986)

52% (1996)

52% (1990)

52% (2015)

53% (1999)

62% (1985)

55% (1993)