Many older statistical publications haven't been digitized, but they're a valuable source of historical country information. Yale has many of these print publications from around the world; try searching in Orbis using one of the following strategies.
Some of these publications change names over time, so check the "Continues" or "Continued by" information at the bottom of the Orbis record. When you've found a statistical publication from your country of interest, you can also use the subject heading(s) in the Orbis record to find additional related publications.