One-minute data:

April 2004
May 2004
June 2004
July 2004
August 2004
September 2004
October 2004

August 2006
August 1, 2006

Hourly data:
April 2004

Midnight daily data:
April 2004
May 2004
June 2004
July 2004

7 am daily data:
April 2004
May 2004
June 2004