The map below shows amount of tanks per 100 thousand people.
Number of Main Battle Tanks (MBT) per 100k = ( no. of MBTs / population ) * 100 000
Countries in gray have no data on GFP.com.
Countries colored in blue have zero tanks as of 2017.
Some of the Balkan countries have a large number of T-55 tanks (and equivalent), which are mostly obsolete in modern tank vs. tank combat, but still, have tactical value.
Other interesting contenders from around the world:
North Korea: 19.78
Saudi Arabia: 3.49