71% (1990)

70% (2011)

76% (2002)

71% (1992)

70% (1996)

76% (1997)

67% (1994)

69% (1990)

71% (1999)

68% (2003)

51% (2017)

65% (2008)

46% (1989)

72% (2007)

66% (2001)

51% (2013)

59% (2004)

48% (2006)

66% (1991)

60% (2007)