If you look at what I think will be you your proper baseline readings (i.e. once you've addressed a couple of those issues mentioned by Darrel)...

Code:
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14439 
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14432
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14432 
14432 
14426
14435 
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14430 
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14431
they're only varying by about 0.00x% per sample period (interrupt)...and when your finger is pressed on the sensor, you should see the value drop by at least 20% (probably 50% or more if your sensor is decent enough), so there's really no need for averaging.