51% (1987)

58% (1990)

46% (1992)

49% (1987)

32% (1986)

47% (1986)

44% (1989)

45% (1985)

43% (1990)

44% (1986)

37% (1991)

51% (1988)

45% (1985)

59% (1986)

48% (1987)

49% (1990)

53% (1988)

23% (1997)

46% (1986)

46% (1993)