年 |
2006 |
2007 |
2008 |
2009 |
2010 |
2011 |
1月 |
579,855 |
621,914 |
659,829 |
582,995 |
616,112 |
640,441 |
2月 |
559,052 |
599,687 |
617,738 |
523,688 |
569,533 |
580,505 |
3月 |
584,380 |
578,474 |
609,930 |
535,671 |
571,897 |
594,476 |
4月 |
534,140 |
539,684 |
557,357 |
492,412 |
513,616 |
551,519 |
5月 |
520,100 |
521,172 |
542,602 |
467,679 |
519,009 |
547,557 |
6月 |
508,098 |
510,823 |
513,401 |
459,110 |
504,356 |
519,974 |
7月 |
512,194 |
510,518 |
525,607 |
476,270 |
511,535 |
527,169 |
8月 |
530,783 |
531,132 |
528,741 |
495,412 |
514,192 |
537,277 |
9月 |
520,351 |
517,561 |
477,778 |
483,796 |
510,741 |
527,786 |
10月 |
544,311 |
540,961 |
537,665 |
521,880 |
522,322 |
550,458 |
11月 |
554,208 |
568,218 |
546,277 |
532,696 |
550,911 |
572,147 |
12月 |
579,073 |
614,573 |
553,255 |
595,763 |
613,253 |
|
| 单位：百万立方英尺 |
