60% (1991)

40% (1988)

70% (1993)

70% (1988)

55% (1999)

60% (2000)

0% (1987)

70% (2001)

75% (1995)

56% (1985)

57% (1986)

63% (1983)

55% (1988)

70% (1991)

50% (1983)

43% (1983)

71% (1988)

70% (2000)

67% (1996)

42% (1985)