67% (1991)

60% (2002)

62% (1994)

54% (1995)

61% (1999)

59% (2013)

55% (1996)

66% (2002)

61% (1996)

58% (1988)

50% (1998)

52% (1997)

51% (1993)

50% (2002)

0% (1993)