68% (2003)

64% (2008)

48% (2006)

68% (2004)

44% (2002)

59% (2010)

77% (2002)

52% (2017)

69% (2011)

71% (2007)

66% (2001)

77% (1997)

51% (2013)

67% (1997)

68% (2006)

45% (1993)

0% (1990)

70% (1996)

50% (1991)

66% (1991)