There's a little under 200 countries now. The number of democracies by any definition that leaves no inter-democracy wars is a small fraction of that (though, yes, in the dozens). The ratio of democracy-democracy dyads to total dyads is smaller (for reasons which should be mathematically obvious) than the ratio of democracies to countries.
> Uh, Soviet ended 1989. Then the Balkan got free -
Uh, Yugoslavia split from the Soviet bloc in 1948, and Tito died in 1980.