73% (1991)

70% (2012)

63% (2003)

65% (1992)

47% (2014)

68% (1994)

65% (1999)

60% (2009)

71% (1995)

44% (1992)

59% (1992)

65% (1996)

48% (1999)

52% (2007)

65% (1989)

55% (1994)

68% (1996)

63% (1998)

40% (2001)

67% (1994)