Exchange rates vary day-by-day and cannot be predicted.  Different banks have different exchange rates on a given day.  

The links in the table lead to a Commonwealth Bank currency conversion page to give an estimate of the cost of paying this amount of Australian dollars in another currency.  The particular conversion page you see is the Commonwealth Bank currency converter converting from Australian to the foreign currency, as if AUD$ were being used to purchase the foreign currency.  (From mid-2008, I have found this to be flaky, from both Firefox and Internet Explorer.  It usually works once, but may not work for a second figure.)   This reflects a different rate than the one for buying AUD$ with the foreign currency.  For instance by looking at the rates at http://www.commbank.com.au/guides/personal/other/foreignexchangerates.asp shows that conversion pages used below work from the "sells outward remittances" rate (money going from Australia to another country) but what we need is the opposite - the "buys inward remittances" rate.

In order to provide a better estimate of the foreign currency cost, I have added a fudge factor to increase the amount the Commonwealth Bank page converts.  The factor approximately reflects the Commonwealth Bank's margins and is:

• 1.3% for the US dollar
• 2.6% for the  UK pound
• 3.2% for the Euro, Yen and Singapore Dollar 
• 2.8% for the others. 

Please remember these are estimates.  Each bank has its own rates, and for a "Telegraphic AKA Wire Transfer" or for any other form of payment, the bank will charge an additional fee.