what is the 26 week t bill rate

Among Bill Com (BILL) and AT&T (T), AT&T (T) had the best week the week of July 30, 1984, returning 6.7%.

ASSET WEEK % RETURN
AT&T (T)
11/21/1983 - 11/27/1983
0%
AT&T (T)
11/28/1983 - 12/4/1983
-2.66%
AT&T (T)
12/5/1983 - 12/11/1983
-1.89%
AT&T (T)
12/12/1983 - 12/18/1983
0.63%
AT&T (T)
12/19/1983 - 12/25/1983
0.22%
AT&T (T)
12/26/1983 - 1/1/1984
0.22%
AT&T (T)
1/2/1984 - 1/8/1984
5.54%
AT&T (T)
1/9/1984 - 1/15/1984
2.02%
AT&T (T)
1/16/1984 - 1/22/1984
2.59%
AT&T (T)
1/23/1984 - 1/29/1984
-4.22%
AT&T (T)
1/30/1984 - 2/5/1984
-0.21%
AT&T (T)
2/6/1984 - 2/12/1984
-4.03%
AT&T (T)
2/13/1984 - 2/19/1984
1.27%
AT&T (T)
2/20/1984 - 2/26/1984
-1.64%
AT&T (T)
2/27/1984 - 3/4/1984
2.11%
AT&T (T)
3/5/1984 - 3/11/1984
-1.64%
AT&T (T)
3/12/1984 - 3/18/1984
-1.45%
AT&T (T)
3/19/1984 - 3/25/1984
-0.22%
AT&T (T)
3/26/1984 - 4/1/1984
-2.33%
AT&T (T)
4/2/1984 - 4/8/1984
-2.83%
AT&T (T)
4/9/1984 - 4/15/1984
0.68%
AT&T (T)
4/16/1984 - 4/22/1984
0.86%
AT&T (T)
4/23/1984 - 4/29/1984
4.44%
AT&T (T)
4/30/1984 - 5/6/1984
0%
AT&T (T)
5/7/1984 - 5/13/1984
-2.1%