54% (2012)

67% (2003)

60% (1997)

68% (2004)

67% (2000)

67% (2007)

51% (2003)

46% (2004)

57% (2004)

59% (2001)

59% (2006)

56% (1999)

60% (2009)

57% (1993)

0% (1971)

25% (2004)

51% (2004)

70% (1991)

70% (2002)

48% (2000)