60% (1997)

63% (2007)

70% (1989)

35% (1988)

54% (1998)

48% (2000)

63% (2004)

59% (2006)

65% (1993)

40% (1989)

60% (1993)

54% (1985)

60% (2004)

42% (1986)

60% (1999)

76% (1995)

45% (1992)

63% (1991)

52% (1989)

57% (1992)