IMHO that report is bogus, it says 1,9% of Dutch households have guns.
Since you are not allowed to have a gun here under any circumstance I highly doubt those statistics are correct.
There are people who have guns in their house because they are members of a shooting club, but they are not allowed to have ammo, they can only shoot at the range for which membership is mandatory for anyone who has a license.
Having been in Israel once, I was shocked to see how many people wear guns (no toy guns either, .45s or something).