70% (1990)

68% (2004)

70% (2011)

76% (1997)

77% (2002)

72% (1999)

70% (1996)

72% (1992)

68% (1994)

69% (1990)

64% (2008)

66% (1991)

51% (2017)

66% (2001)

68% (2006)

61% (2011)

68% (2003)

44% (2002)

71% (2007)

51% (2013)