Interesting that it's not a percentage of your wage, seeing as you pay more unemployment insurance/social security the more you earn (at least you do in Austria and Germany).
I believe it is tied to wage, but it isn't really designed to support high income earners and has a relatively low ceiling as far as software engineers are concerned.
It is a percentage of your wage, but they have pretty tight lower and upper bounds on it. Where I'm at in Ohio, it's one-half of your average weekly wage, but also constrained within $118-$435 pre-tax.