76% (1997)

70% (2011)

50% (2007)

70% (1996)

60% (2011)

64% (2008)

77% (2002)

59% (2010)

52% (2017)

68% (2004)

71% (1999)

71% (1992)

67% (1991)

60% (2007)

50% (1991)

72% (1999)

44% (2002)

66% (2001)

45% (1993)

51% (2013)