51% (2007)

66% (2007)

63% (2005)

61% (2003)

56% (2006)

48% (2001)

70% (1996)

45% (1999)

52% (2004)

67% (1997)

55% (1998)

28% (2002)

56% (2003)

60% (1995)

45% (2002)

55% (2001)