69% (2007)

73% (2002)

70% (1996)

69% (1993)

0% (2000)

60% (2007)

60% (2006)

64% (2008)

69% (1989)

58% (1988)

73% (1987)

70% (1990)

100% (1996)

71% (1988)

45% (2005)

72% (1992)

67% (2005)

0% (2003)

51% (2004)

76% (1989)