11/18/97	0.0	NaN
2/12/98		9.5	NaN
2/26/98		20.0	NaN
3/12/98		67.0	NaN
3/27/98		90.0	NaN
4/13/98		100.0	NaN
4/27/98		96.9	NaN
5/7/98		96.7	NaN
5/21/98		96.6	25.0
6/4/98		96.7	17.2
6/18/98		96.3	85.2
7/2/98		90.6	24.1
7/17/98		89.7	26.9
7/30/98		84.6	54.5
8/13/98		93.1	40.7
8/27/98		88.5	17.4
9/10/98		83.9	41.9
9/24/98		71.4	38.9
10/7/98		76.6	4.3
10/23/98	71.4	25.0
11/5/98		70.0	47.6
11/19/98	69.0	20.0
12/3/98		34.5	30.0
12/17/98	57.6	21.1
12/31/98	34.5	20.0
1/14/99		21.9	28.6
1/28/99		31.0	0.0
2/10/99		25.8	0.0
2/25/99		21.9	0.0
3/11/99		24.1	0.0
3/25/99		22.2	25.0
4/8/99		18.2	33.3
5/7/99		45.7	25.0
6/4/99		12.5	25.0
6/30/99		100.0	21.9