51% (1998)

62% (2004)

60% (1989)

59% (2004)

57% (2009)

53% (2011)

55% (1993)

80% (1977)

53% (2007)

53% (1999)

46% (1993)

76% (1982)

48% (2013)

30% (2017)

51% (2000)

57% (2005)

44% (2010)

59% (2008)

60% (2018)

56% (2021)