Date
- 1980-04-01T08:00:00Z1
- 1982-04-01T08:00:00Z1
- 1983-04-01T08:00:00Z1
- 1984-01-01T08:00:00Z1
- 1985-01-01T08:00:00Z1
- 1986-04-01T08:00:00Z1
- 1987-04-01T08:00:00Z1
- 1988-04-01T08:00:00Z1
- 1989-01-01T08:00:00Z1
- 1990-04-01T08:00:00Z1
- 1991-04-01T08:00:00Z1
- 1992-04-01T08:00:00Z1
- 1993-04-01T08:00:00Z1
- 1994-04-01T08:00:00Z1
- 1995-04-01T08:00:00Z1
- 1996-04-01T08:00:00Z1
- 1997-01-01T08:00:00Z1
- 1998-01-01T08:00:00Z1
- 1999-01-01T08:00:00Z1
- 2000-01-01T08:00:00Z1