59% (1984)

46% (1990)

52% (1993)

58% (1989)

47% (2008)

60% (1990)

57% (1991)

45% (1989)

53% (1991)

51% (1994)

56% (1991)

56% (1993)

39% (1993)

34% (2006)

56% (1992)

41% (1994)

61% (1996)

32% (2005)

50% (2001)

44% (2020)