56% (1999)

55% (2014)

58% (2005)

67% (1991)

52% (1999)

70% (1997)

70% (2001)

60% (2018)

58% (2015)

65% (1993)

64% (1998)

56% (1998)

55% (2009)

59% (2003)

62% (1996)

49% (1967)

56% (2000)

64% (1994)

42% (1998)

47% (1993)