46% (2004)

59% (2000)

69% (2001)

55% (1998)

72% (1994)

66% (1997)

42% (2003)

70% (2004)

54% (1995)

67% (1994)

75% (1993)

60% (1999)

59% (2006)

75% (1999)

69% (1991)

61% (1990)

65% (1996)

45% (2003)

71% (2003)

49% (2001)