55% (1999)

55% (2014)

54% (2009)

58% (2005)

58% (2003)

70% (1997)

60% (2018)

70% (2001)

63% (1998)

68% (1991)

57% (2015)

49% (1967)

62% (1996)

57% (1998)

64% (1993)

52% (1999)

55% (2000)

47% (1993)

42% (1998)

60% (1991)