53% (1993)

72% (1999)

69% (2001)

73% (1998)

72% (2017)

63% (2010)

66% (1977)

40% (2003)

61% (1976)

59% (1991)

63% (1990)

68% (1990)

62% (1972)

64% (1974)

65% (1980)

59% (1993)

44% (2009)

48% (1976)

44% (1992)

60% (1996)