I would suggest removing the amount escrowed all together.

IMO, most people who represent how much they have escrowed do so in a misleading way, one way or another.

The value of coins varies so much that it is difficult to measure the value of a trade if the coins were held for even a week or so, which is not unusual. As h&c mentioned, holding 1 bitcoin 100 times is very different than holding 100 btc once, and holding one btc two years ago is different than holding a coin today.

Also, holding tokens on behalf of the issuer is borderline dishonest that there is even escrow because it would be trivial for the issuer to effectively void the specific tokens.