Go here and research your favorite runner:http://www.nyrrc.org/cgi-bin/start.cgi/mar-programs/archive/archive_search.html
Positives:
2:10:28 1:04:26 4:58 Abdelkhader El Mouaziz 1999 (4th place)
2:10:09 1:03:08 4:58 Abdelkhader El Mouaziz 2000 (he won that year by over 2 minutes)
2:08:07 1:03:49 4:53 Rodgers Rop 2002 (won)
2:11:11 1:05:39 5:00 Rodgers Rop 2003 (2nd)
2:23:10 1:10:51 5:27 Paula Radcliffe 2004 (won)
2:23:13 1:10:52 5:27 Susan Chepkemei (right behind Paula)
2:09:28 1:04:17 4:56 Hendrik Ramaala 2004
A few winners have been even or slightly negative:
2:07:42 1:03:52 4:52 Tesfaey Jifar 2001
2:09:30 1:04:57 4:56 Paul Tergat 2005
2:09:58 1:05:36 4:57 Marilson Dos Santos 2006
2:24:41 1:13:02 5:31 Jelena Prokopcuka 2005
2:25:05 1:13:52 5:32 Jelena Prokopcuka 2006 (WOW what a neg. split)
But it's much different for the top guys running for the win- they have the adrenaline to push into a negative split. Positive splitting is by far the rule at NYC.