55% (1992)

35% (1987)

20% (1993)

61% (1978)

40% (2000)

72% (1994)

62% (1992)

45% (1996)

53% (1998)

59% (2004)

80% (1984)

60% (1990)

0% (1994)

50% (2004)

70% (1991)

75% (1975)

55% (1950)

55% (1989)

47% (2010)

50% (1992)