At the usual risk of re-stating the obvious, there are two major issues here: the list of countries for which a carnet is required, and the percentages required by different carnet-issuers.
With regards to the first issue, the OP has posted a ridiculously inaccurate list of countries for which a carnet is required. It should surprise no one that this list came directly from his issuing authority, but that doesn't alter the fact that the list is nonsense.
With respect to the second, yes it's true that percentages vary according to the arbitrary whims of the issuer. If you need a carnet, you might be stuck with whatever they deem necessary. However, first see #1.
Mark
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