68% (1993)

60% (2007)

63% (2008)

66% (1998)

69% (2014)

67% (2011)

63% (2001)

72% (2005)

69% (1991)

65% (1985)

67% (1992)

58% (2015)

58% (2007)

45% (2002)

44% (2000)

67% (1982)

65% (1995)

72% (2003)

71% (1989)

63% (1996)