year mo da  disk
---- -- -- ------
1998 11 11   0.14
1998 11 12   0.21
1998 11 13   0.24
1998 11 14   0.28
1998 11 15   0.29
1998 11 16   0.48
1998 11 17   0.54
1998 11 18   0.54
1998 11 19   0.52
1998 11 20   0.55
1998 11 21   0.57
1998 11 22   0.58
1998 11 23   0.59
1998 11 24   0.62
1998 11 25   0.65
1998 11 26   0.65
1998 11 27   0.66
1998 11 28   0.66
1998 11 29   0.68
1998 11 30   0.72
1998 12  1   0.70
1998 12  2   0.70
1998 12  3   0.73
1998 12  4   0.75
1998 12  5   0.77
1998 12  6   0.79
1998 12  7   0.80
1998 12  8   0.81
1998 12  9   0.78
1998 12 10   0.79
1998 12 11   0.79
1998 12 12   0.84
1998 12 13   0.84
1998 12 14   0.86
1998 12 15   0.87
1998 12 16   0.88
1998 12 17   0.89
1998 12 18   0.90
1998 12 19   0.89
1998 12 20   0.92
1998 12 21   0.92
1998 12 22   0.92
1998 12 23   0.92
1998 12 24   0.44
1998 12 25   0.54
1998 12 26   0.60
1998 12 27   0.65
1998 12 28   0.65
1998 12 29   0.65
1998 12 30   0.65
1998 12 31   0.66
1999  1  1   0.66
1999  1  2   0.66
1999  1  3   0.66
1999  1  4   0.67
1999  1  5   0.67
1999  1  6   0.67
1999  1  7   0.67
1999  1  8   0.67
1999  1  9   0.68
---- -- -- ------