My point is look at other data. Climate, GPD, education, cultural data, etc. Just the climate alone is a great indicator for e.g. capita per speaker companies. Look at Canada, they have indoor weather throughout most of the year, and they have proportionately more hifi companies. Scandinavia - look at weather and the long winter, they have more companies than France while a fraction of the population.
Austria with 9 million people and major brands? Look at their history of composers.
How many hifi companies in Africa? Is it a mystery? Not at all. To me Estonia is not a surprise at all. What is more surprising is countries with no hifi brand, that would be a better question to me. But your question, your interest is your proragative, it's just my opinion....