年 |
1月 |
2月 |
3月 |
4月 |
5月 |
6月 |
7月 |
8月 |
9月 |
10月 |
11月 |
12月 |
1973 |
1,948 |
1,962 |
1,907 |
1,814 |
1,898 |
1,839 |
1,880 |
1,896 |
1,840 |
1,875 |
1,863 |
1,926 |
1974 |
1,930 |
1,760 |
1,895 |
1,780 |
1,847 |
1,740 |
1,818 |
1,790 |
1,755 |
1,767 |
1,729 |
1,790 |
1975 |
1,779 |
1,645 |
1,738 |
1,672 |
1,689 |
1,634 |
1,677 |
1,677 |
1,603 |
1,646 |
1,618 |
1,730 |
1976 |
1,751 |
1,647 |
1,714 |
1,623 |
1,673 |
1,640 |
1,676 |
1,636 |
1,565 |
1,639 |
1,636 |
1,753 |
1977 |
1,740 |
1,674 |
1,751 |
1,644 |
1,692 |
1,649 |
1,674 |
1,645 |
1,599 |
1,628 |
1,606 |
1,726 |
| 单位：十亿立方英尺 |
