71% (1990)

71% (1992)

70% (2011)

77% (2002)

76% (1997)

67% (1994)

71% (1999)

70% (1990)

70% (1996)

65% (2008)

51% (2017)

66% (2001)

68% (1997)

68% (2006)

60% (2011)

68% (2003)

72% (2007)

46% (1989)

48% (2006)

60% (1999)