55% (1987)

51% (1990)

60% (2008)

68% (2002)

68% (2000)

59% (2004)

57% (2003)

64% (2005)

70% (1990)

46% (1995)

60% (1986)

56% (2003)

44% (1995)

73% (1998)

61% (1996)

40% (1997)

50% (2005)

61% (2005)

62% (1986)

58% (1998)