56% (1993)

47% (1998)

72% (1991)

73% (1996)

60% (1998)

59% (1994)

48% (2000)

67% (1997)

58% (1995)

50% (1999)

65% (2004)

67% (2013)

61% (1987)

58% (1999)

58% (1996)

59% (1999)

67% (1995)

59% (1995)

51% (1992)

74% (1983)