68% (2005)

63% (2009)

50% (1998)

30% (2003)

64% (2007)

60% (2004)

55% (1999)

63% (2004)

70% (2005)

55% (1991)

10% (1991)

28% (1990)

60% (1992)

40% (2002)

53% (1997)

31% (2006)

60% (1990)

49% (2002)

0% (1990)

51% (1993)