66% (1976)

67% (1970)

72% (1971)

51% (1973)

59% (1972)

59% (1975)

62% (1973)

67% (1974)

57% (1975)

57% (1974)

72% (1975)

60% (1975)

70% (1972)

0% (1973)

52% (2005)

0% (2000)

60% (2010)