62% (2004)

60% (1989)

59% (2004)

53% (2011)

55% (1993)

54% (2007)

48% (2009)

47% (1993)

53% (2012)

56% (2001)

53% (1999)

52% (1996)

57% (2005)

59% (2008)

49% (2003)

52% (2005)

49% (2011)

47% (2013)

51% (1997)

52% (1998)