Thanks for the responses. Sorry took me a while to reply to this one..
I'm actually surprised that many European countries have free trolleys. I thought they would have charged several Euros.. (Apart from porters that are sometimes offered). Thanks for all your inputs on which airports/countries have free trolleys.
I know that most airports where you have to pay for trolleys are usually those in the departure area. I have not seen any airports charge you during arrivals.
This now then leads me to my next question. When you do get charged for the trolley, does any of them offered refunds if you return the trolleys? (I remember this at Montparnasse train station in Paris, where you can return the trolley and get refunds). I, for one, was quite irritated that here in Sydney, we do not get a refund.
So thanks again for any replies in advance