I got this data from coach Karl; it was part this article regarding the heat and times at the 2012 Boston Marathon.You will notice how much slower the field was this year in comparison to 2011.

RESULTS BOSTON 2012
21,554 fnshrs
BOSTON 2011*
23,879 fnshrs
BOSTON  2004
16,743 fnshrs
BOSTON 1976
approx 1,800
50th place 2:39:30 2:26:06 2:35:51 2:35:38
1000th place 3:09:37 2:55:41 3:17:51 approx 3:24
3:00 530 runners 1,519 runners 320 runners 415 runners
4:00 8,646 runners 16,209 5497 runners na
Avg Time 4:18:27 3:49:54 4:13:02 not known
Registered runners 26,717 MONDAY AVERAGE
Number pick-ups 22,853 85.5% 91-92%
Starters 22,426 98.1% of above virtually all of above
Finishers 21,554 96.1% of above 97-98% of above
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