Date
- 1952-01-01T08:00:00Z1
- 1953-02-01T08:00:00Z1
- 1954-01-01T08:00:00Z1
- 1954-06-01T07:00:00Z1
- 1955-01-01T08:00:00Z1
- 1955-06-01T07:00:00Z1
- 1956-01-01T08:00:00Z1
- 1956-06-01T07:00:00Z1
- 1957-06-01T07:00:00Z1
- 1958-06-01T07:00:00Z1
- 1960-06-01T07:00:00Z1
- 1961-01-01T08:00:00Z1
- 1961-06-01T07:00:00Z1
- 1962-01-01T08:00:00Z1
- 1962-06-01T07:00:00Z1
- 1964-05-01T07:00:00Z1
- 1965-01-01T08:00:00Z1
- 1966-05-01T07:00:00Z1
- 1967-05-01T07:00:00Z1
- 1968-05-01T07:00:00Z1