55% (2017)

70% (2016)

72% (2016)

46% (2015)

62% (2015)

54% (2015)

56% (2013)

59% (2012)

56% (2011)

54% (2010)

60% (1989)

65% (2010)

62% (1976)

59% (1975)

70% (1967)

70% (1963)

70% (1978)

57% (2009)

55% (2009)

75% (1997)