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Per bbref - here are the RC totals and actual runs produced totals for AL in 2009:
TEAM - RC - Runs
NYY - 1003 - 915
BOS - 918 - 883
LAA - 880 - 872
TBR - 867 - 817
TOR - 852 - 803
MIN - 851 - 798
(avg) 820 - 784 ***
TEX - 812 - 781
CLE - 810 - 773
DET - 784 - 759
BAL - 783 - 743
CHW - 751 - 741
OAK - 747 - 724
KCR - 719 - 686
SEA - 709 - 640
I imagine other sites might use self-updating formula (re-setting based on current total league runs). But, bbref OBVIOUSLY doesn't - being that the average RC comes out 36 runs above the actual average runs scored. (But, even with that - Seattle was 69 runs off, which would be 33 runs short if you do the simple linear adjustment.