51% (1998)

59% (2004)

62% (2004)

46% (1993)

54% (2007)

55% (1993)

60% (1989)

53% (2002)

53% (2011)

48% (2009)

80% (1977)

49% (2003)

51% (1997)

65% (1985)

77% (1982)

51% (2005)

48% (2013)

30% (2017)

57% (2005)

60% (2018)