68% (1991)

68% (1995)

60% (1975)

60% (1965)

67% (2002)

50% (1988)

58% (2000)

57% (2012)

42% (2010)

60% (2005)

53% (2009)

50% (1995)

0% (1970)

54% (2000)

53% (2007)

47% (1983)

60% (1988)

52% (2018)

63% (2013)

37% (2015)