You might try your luck on "classic & vintage" though your bike doesn't appear to be old enough to be either. However many members there are extremely dialed in to this kind of minutia.
As crapshoot guess based on some of the components, I'd say a few over 10 years or so. One way you can narrow it down is by dating the crankset, since that one wasn't made for too many years. Then look at how many speeds, and compare to the introduction of one more in that group level, ie, a 9s Ultegra bike would usually precede the advent of 10s Ultegra.
I hope this helps you, but I'm sure some of the C&V mavens can pin it down to a very narrow range if not the exact year.
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