Wow, that's such a small difference, if i calculate now my difference it is of around 1800 CAD. Actually I already put more money into my account and even took the updated Bank Certificate along with Transaction History with me on the day of my interview, but the Visa officer didn't take a copy of it like he did of other updated documents. My funds were assessed I think in 2nd or 3rd month after AOR I am not sure. The currency fluctuation was very drastic and sudden. Another thing is I heard that they lock the exchange rate on the date of AOR but I also heard it depends on Visa Officer's discretion to what action he takes.