67% (1990)

47% (1995)

67% (2010)

62% (2005)

46% (1995)

53% (2003)

52% (2005)

59% (2010)

60% (2009)

71% (1996)

52% (2008)

56% (2004)

33% (1992)

58% (1996)

60% (1991)

56% (1997)

51% (2010)

48% (1998)

43% (1997)

50% (1995)