63% (1990)

69% (1991)

63% (1988)

59% (2001)

58% (2005)

44% (2001)

42% (1996)

68% (2005)

57% (2008)

65% (1999)

62% (1989)

60% (1994)

67% (2001)

69% (2006)

65% (2005)

55% (2002)

61% (1994)

53% (2003)

57% (1997)

56% (1999)