69% (2020)

64% (2017)

80% (2015)

72% (2012)

65% (1987)

65% (1992)

74% (1992)

59% (1997)

53% (1987)

43% (2010)

61% (1991)

25% (1993)

60% (1975)

72% (1956)

73% (2002)

43% (1992)

53% (1996)

18% (2007)

0% (2010)

97% (1987)