No, you can not count those countries because most nations do not consider many of those countries true speakers of English.

It is most commonly accepted that the UK, USA, Canada, Austraila, New Zealand, and sometimes South Africa are considered true English speaking countries.

If you notice most English schools are not looking for teachers from the Bahamas or one of the many African Nations.

Count the population of the countries that are considered true native speakers of English. You can't consider people from India as speakers of British Engish, and you can't count people from Saudi Arabia as speakers of North American English. Only count the countries that the majority of ESL teachers are from, which are: UK, USA, Canada, Austraila, and New Zealand. The are many foreigners in all of these countries that are not native speakers, so it equals out. And as you can see, the numbers are in the majority of North American style English.

North American Style English: English dialect spoken in Canada and United States.

Queen's English: Style of English spoken in the UK.

Most Austrailains speak a dialect of Queen's English.