72% (1998)

59% (1999)

62% (1996)

61% (2005)

56% (1993)

53% (2001)

59% (1994)

69% (1990)

47% (2002)

52% (2000)

57% (1998)

52% (2002)

62% (2008)

57% (1997)

64% (1997)

48% (1992)

67% (1996)

60% (2006)

60% (2004)

64% (2004)