63% (1993)

42% (1992)

51% (1990)

33% (1995)

59% (1995)

44% (1993)

49% (1995)

40% (1997)

50% (1995)

33% (2003)

40% (1997)

33% (1998)

45% (1996)

30% (1994)

48% (1998)

32% (1989)