[yoha]

You forgot a zero:

   >>> (55893+20785+13582+13230+11696+10938+6432+5682+4796+4191+3845+3734+3664+3655+3330+3206+3136+3126+3050+3002) / 1e7
   0.0180973

That is, 1.8%. This is confirmed by http://maxmcd.com/passwords.html.