60% (1995)

63% (1993)

38% (1995)

45% (1992)

45% (1993)

51% (1990)

48% (1998)

50% (1995)

44% (1995)

45% (1997)

46% (1996)

32% (1994)

35% (1998)

32% (1989)

59% (1999)

28% (2003)

25% (1997)