60% (2003)

61% (2003)

63% (2005)

48% (2001)

51% (2007)

70% (1996)

60% (1995)

63% (1994)

67% (1997)

55% (1998)

52% (2004)

45% (1999)

28% (2002)

56% (2003)

45% (2002)

55% (2001)