As stated in another thread - 500,000 bicycles stolen per year in Holland. 90% into containers headed for the 3rd world. Sorry, I don't get Europe indifference to the issue ...
Sort of hate to say it because I like good looking bikes, but the best deterrent is rust and graffiti ... Make it look bad with mis-matched wheels, stickers, and rattle can paint; and they'll prolly just leave it alone ...