71% (1986)

61% (2009)

60% (2013)

61% (1997)

64% (1980)

71% (1981)

66% (1996)

72% (1989)

70% (1984)

55% (1987)

64% (2002)

65% (1995)

71% (1992)

71% (1990)

62% (1999)

56% (1991)

70% (1999)

60% (1980)

75% (2016)

50% (1994)