73% (1976)

59% (1990)

51% (2002)

62% (1997)

65% (1995)

50% (1990)

40% (1991)

61% (1998)

44% (2001)

65% (1999)

49% (1995)

52% (1992)

57% (1993)

46% (2002)

55% (1996)

43% (2002)

57% (1997)

57% (1981)

60% (1994)

51% (1988)