| Year |
Month |
Pounds (x1000) |
| 1989 |
December |
24.68 |
|
November |
25.12 |
|
October |
38.07 |
|
September |
26.98 |
|
August |
44.23 |
|
July |
41.28 |
|
June |
54.09 |
|
May |
68.54 |
|
April |
51.51 |
|
March |
27.31 |
|
February |
12.79 |
| 1989 |
January |
8.12 |
| 1988 |
December |
11.58 |
|
November |
10.86 |
|
October |
29.57 |
|
September |
21.08 |
|
August |
36.33 |
|
July |
47.61 |
|
June |
43.45 |
|
May |
58.98 |
|
April |
38.11 |
|
March |
20.75 |
|
February |
17.01 |
| 1988 |
January |
8.98 |
| 1987 |
December |
12.53 |
|
November |
11.76 |
|
October |
18.24 |
|
September |
29.39 |
|
August |
43.76 |
|
July |
39.11 |
|
June |
56.09 |
|
May |
79.31 |
|
April |
45.36 |
|
March |
18.52 |
|
February |
9.42 |
| 1987 |
January |
6.22 |
| 1986 |
December |
12.80 |
|
November |
14.68 |
|
October |
43.34 |
|
September |
49.52 |
|
August |
43.51 |
|
July |
52.20 |
|
June |
58.12 |
|
May |
66.62 |
|
April |
45.70 |
|
March |
33.79 |
|
February |
19.86 |
| 1986 |
January |
14.85 |
| 1985 |
December |
17.68 |
|
November |
16.02 |
|
October |
20.91 |
|
September |
36.72 |
|
August |
34.60 |
|
July |
30.93 |
|
June |
49.54 |
|
May |
40.77 |
|
April |
32.37 |
|
March |
7.81 |
|
February |
5.77 |
| 1985 |
January |
6.77 |
| 1984 |
December |
5.66 |
|
November |
9.64 |
|
October |
21.84 |
|
September |
32.02 |
|
August |
30.72 |
|
July |
46.80 |
|
June |
34.44 |
|
May |
27.66 |
|
April |
17.97 |
|
March |
12.84 |
|
February |
7.20 |
| 1984 |
January |
10.08 |
| 1983 |
December |
13.57 |
|
November |
14.76 |
|
October |
16.25 |
|
September |
24.36 |
|
August |
30.51 |
|
July |
32.54 |
|
June |
29.86 |
|
May |
42.47 |
|
April |
19.03 |
|
March |
11.26 |
|
February |
7.85 |
| 1983 |
January |
5.38 |
| 1982 |
December |
5.59 |
|
November |
10.77 |
|
October |
16.99 |
|
September |
18.02 |
|
August |
14.94 |
|
July |
20.54 |
|
June |
31.84 |
|
May |
32.38 |
|
April |
32.15 |
|
March |
7.38 |
|
February |
7.74 |
| 1982 |
January |
8.74 |
| 1981 |
December |
8.61 |
|
November |
7.24 |
|
October |
11.39 |
|
September |
29.36 |
|
August |
25.84 |
|
July |
33.96 |
|
June |
35.71 |
|
May |
36.04 |
|
April |
28.35 |
|
March |
15.06 |
|
February |
7.43 |
| 1981 |
January |
11.92 |
| 1980 |
December |
13.50 |
|
November |
12.65 |
|
October |
12.06 |
|
September |
16.68 |
|
August |
22.01 |
|
July |
26.33 |
|
June |
31.28 |
|
May |
41.32 |
|
April |
31.75 |
|
March |
7.29 |
|
February |
11.25 |
| 1980 |
January |
12.30 |
| 1979 |
December |
15.04 |
|
November |
10.66 |
|
October |
14.00 |
|
September |
12.68 |
|
August |
14.21 |
|
July |
16.26 |
|
June |
18.74 |
|
May |
21.73 |
|
April |
29.90 |
|
March |
12.14 |
|
February |
3.03 |
| 1979 |
January |
3.75 |
| 1978 |
December |
5.21 |
|
November |
7.78 |
|
October |
13.69 |
|
September |
10.90 |
|
August |
20.35 |
|
July |
23.60 |
|
June |
23.66 |
|
May |
33.52 |
|
April |
11.01 |
|
March |
8.77 |
|
February |
4.19 |
| 1978 |
January |
4.67 |
| 1977 |
December |
6.49 |
|
November |
12.54 |
|
October |
13.58 |
|
September |
14.88 |
|
August |
26.10 |
|
July |
33.65 |
|
June |
24.81 |
|
May |
21.36 |
|
April |
22.58 |
|
March |
4.65 |
|
February |
4.89 |
| 1977 |
January |
3.97 |
| 1976 |
December |
17.27 |
|
November |
5.85 |
|
October |
12.25 |
|
September |
10.84 |
|
August |
21.33 |
|
July |
17.62 |
|
June |
17.50 |
|
May |
10.14 |
|
April |
11.04 |
|
March |
7.49 |
|
February |
1.93 |
| 1976 |
January |
1.97 |
| 1975 |
December |
5.79 |
|
November |
3.97 |
|
October |
5.85 |
|
September |
11.57 |
|
August |
10.58 |
|
July |
12.67 |
|
June |
16.01 |
|
May |
9.88 |
|
April |
7.25 |
|
March |
3.23 |
|
February |
1.61 |
| 1975 |
January |
2.13 |
| 1974 |
December |
3.15 |
|
November |
3.58 |
|
October |
2.93 |
|
September |
6.02 |
|
August |
6.36 |
|
July |
6.56 |
|
June |
7.20 |
|
May |
8.39 |
|
April |
4.04 |
|
March |
3.20 |
|
February |
1.84 |
| 1974 |
January |
1.05 |
| 1973 |
December |
1.40 |
|
November |
1.77 |
|
October |
3.54 |
|
September |
5.78 |
|
August |
5.94 |
|
July |
10.92 |
|
June |
11.81 |
|
May |
9.02 |
|
April |
6.02 |
|
March |
1.77 |
|
February |
1.04 |
| 1973 |
January |
1.03 |
| 1972 |
December |
1.91 |
|
November |
2.73 |
|
October |
3.91 |
|
September |
2.76 |
|
August |
3.60 |
|
July |
5.80 |
|
June |
6.13 |
|
May |
4.32 |
|
April |
2.91 |
|
March |
2.56 |
|
February |
0.74 |
| 1972 |
January |
1.87 |
| 1971 |
December |
2.57 |
|
November |
1.47 |
|
October |
1.72 |
|
September |
3.06 |
|
August |
3.55 |
|
July |
3.60 |
|
June |
3.54 |
|
May |
3.53 |
|
April |
1.73 |
|
March |
1.53 |
|
February |
2.59 |
| 1971 |
January |
1.24 |
| 1970 |
December |
0.84 |
|
November |
2.59 |
|
October |
2.04 |
|
September |
4.11 |
|
August |
3.27 |
|
July |
5.35 |
|
June |
5.15 |
|
May |
6.92 |
|
April |
3.08 |
|
March |
1.79 |
|
February |
1.46 |
| 1970 |
January |
0.52 |
| 1969 |
December |
3.00 |
|
November |
1.35 |
|
October |
2.79 |
|
September |
2.67 |
|
August |
2.79 |
|
July |
3.88 |
|
June |
4.85 |
|
May |
4.62 |
|
April |
1.17 |
|
March |
1.09 |
|
February |
0.31 |
| 1969 |
January |
0.50 |
|