73% (2014)

68% (2018)

64% (2002)

67% (1994)

59% (1994)

62% (2014)

75% (1976)

62% (1997)

65% (1999)

60% (2005)

67% (1992)

65% (1978)

59% (1981)

64% (1998)

70% (1993)

50% (1991)

64% (2003)

59% (1981)

56% (1985)

60% (1980)