57% (1988)

50% (2003)

48% (1992)

36% (1995)

69% (2006)

42% (1993)

53% (1995)

35% (1990)

27% (1991)

46% (2006)

36% (1987)

78% (2007)

49% (2004)

34% (1989)

49% (2007)

60% (2005)

37% (2006)

42% (1987)

35% (2005)

39% (1990)