Your intuition is correct.
According to current accounting standard,
practitioners define the categories by the following dimensions,
Revenue %, profit % or both.

If the export amount is beyond 80%, it is no doubt.
If the ratio is lower than 20%, it is also no doubt.
The most difficult one is between 20% and 80%.

Using your academic guess please.
For my understanding, any one lower than 50%, should not be categorized as manufacturer oriented at international market.
I hope this helps.
Thanks.

Thank you!