20% (1980)

17% (1986)

67% (1986)

57% (2005)

53% (2011)

48% (1984)

54% (2004)

54% (1988)

50% (2006)

61% (1995)

40% (2004)

44% (2004)

20% (1994)

35% (2005)

50% (2005)

20% (1990)

59% (1997)

62% (2018)

35% (1971)

45% (1985)