55% (2003)

58% (2005)

57% (2005)

55% (1993)

64% (1989)

71% (2016)

55% (2002)

58% (1996)

62% (1994)

66% (2001)

53% (1988)

64% (1988)

56% (2002)

62% (1989)

63% (1993)

67% (2003)

62% (1990)

64% (1999)

59% (2001)

57% (2008)