Circle on stick

German cities have lots of debt. The German newspaper “Die Welt” says that. Have a look.

Cities with the highest debt - debt level from loans, bonds and cash credits. Source: The German paper "Die Welt"

Cities with the highest debt – debt level from loans, bonds and cash credits
Source: The German newspaper “Die Welt”, 2013–12–10 (online, in German only)

Circle means debt. Big red circle means lots of debt. Small red circle means less debt. Circle that is glued on a stick means debt, too. Orange circle that is glued on a long stick means lots of debt. Orange circle that is glued on a short stick means less debt.

Looks funny. So you take a closer look. Doing that, you begin to wonder. #1 to #4 is like this. #5 to #15 is different. Why? How long would a circle on a stick be for a 3.2? He says: Why not relatively? By resident? In relation to the trade tax?