61% (1999)

42% (1996)

47% (1992)

54% (1991)

59% (1995)

48% (1993)

61% (1993)

53% (1996)

39% (2000)

46% (2000)

52% (1992)

56% (1994)

44% (1996)

52% (1994)

46% (1997)

45% (1993)

51% (1995)

36% (1995)

50% (1993)

43% (1991)