48% (1992)

45% (1993)

46% (2006)

38% (1995)

57% (1988)

37% (2006)

69% (2006)

47% (2007)

46% (2004)

39% (1987)

36% (1994)

51% (1995)

33% (1989)

39% (2008)

47% (2002)

50% (2003)

35% (1987)

45% (2007)

55% (2005)

78% (2007)