62% (1993)

51% (1990)

44% (1993)

43% (1992)

45% (1996)

33% (1995)

60% (1995)

30% (1994)

49% (1995)

43% (1997)

50% (1995)

33% (1998)

48% (1998)

40% (1997)

32% (1989)

33% (2003)