68% (2005)

64% (2007)

63% (2009)

63% (2004)

47% (1993)

10% (1991)

30% (2003)

60% (2004)

55% (1991)

31% (2006)

44% (1995)

40% (2002)

29% (1990)

53% (1997)

17% (2003)

50% (1998)

51% (1993)

48% (1996)

69% (1993)

60% (1992)