73% (1987)

75% (1995)

71% (1988)

65% (2018)

70% (2006)

68% (1993)

50% (1991)

65% (1999)

59% (1995)

62% (1988)

61% (1998)

70% (1998)

69% (1993)

77% (1995)

68% (1994)

78% (2008)

70% (1994)

62% (1996)

66% (1993)

75% (1993)