83% (1997)

67% (1998)

74% (1997)

77% (2008)

78% (2009)

69% (1987)

77% (1998)

60% (1997)

62% (2008)

63% (1988)

47% (1991)

70% (2006)

0% (1991)

35% (1993)

0% (2003)

77% (1983)

0% (1991)

0% (1991)

78% (2006)

48% (1996)