name	date	head
MW45	1993-01-01	212.1
MW45	1993-06-01	211.2
MW45	1993-08-01	210.6
MW45	1994-01-01	212.3
MW45	1994-06-01	211.8
MW45	1994-08-01	211.3
MW45	1995-01-01	211.4
MW45	1995-06-01	211.2
MW45	1995-08-01	210.3
SW387921	1993-01-01	208.4
SW387921	1994-01-01	209.5
SW387921	1995-01-01	208.3
US448769	1993-01-01	211.1
US448769	1994-01-01	211.5
US448769	1995-01-01	210.6
