46% (2004)

55% (1998)

60% (2000)

71% (1994)

65% (1990)

75% (1993)

69% (2001)

55% (1995)

72% (1997)

68% (1991)

49% (2001)

63% (2006)

68% (1997)

75% (2000)

64% (1998)

66% (2001)

70% (2004)

70% (2003)

60% (1999)

65% (1996)