73% (1991)

70% (2012)

63% (2003)

68% (1994)

65% (1999)

65% (1989)

68% (1996)

52% (2007)

71% (1995)

60% (2009)

40% (2001)

47% (2014)

67% (1994)

63% (1998)

72% (2009)

65% (1992)

65% (1996)

59% (2003)

57% (2006)

59% (2002)