Not sure what the source of the figures in the wikipedia article is, but here is the link and extract:
http://en.wikipedia.org/wiki/Ahmadiyya_Muslim_CommunityAn accurate representation of the population of the Ahmadiyya Muslim Community is usually hard to discern. Most Ahmadiyya sources usually estimate the worldwide Ahmadiyya Muslim Community population to be in “the tens of millions”.[25] Yet often Ahmadiyya sources claim to have “hundreds of millions” or “200 million” worldwide.[26] According to some estimates, the country with the largest percentage of Ahmadis is the African republic of Ghana.[27] The country with the most Ahmadis is Pakistan, where there are about 4 million Ahmadis.[28] The Ahmadiyya Muslim Community has 2.011 million adherents in the African Republic of Benin[29], 1 million adherents in India [1] 200,000 in Indonesia, 18,000 in Britain[30], 30,000 in Germany and 30,000 in Canada.
According to non-Ahmadi estimates, there are 50,000 Ahmadi converts from Orthodox Islam in Mali, 24,000 of the same in the Ivory Coast, 100,000 of the same as Bosnian refugees and 45,000 Albanians of the same.[31] Most Ahmadis are from Asia, mainly the Indo-Pak subcontinent, Bangladesh and Indonesia and a considerably large number of Ahmadis, in the tens or hundreds of millions are from the continent of Africa.[30] In the year 1957, there were 100,000 Ahmadis from the African Republic of Ghana[32] As of 1994, there were 150,000 converts to the Ahmadiyya Muslim Community from French-Speaking countries.[33]
The Ahmadiyya Muslim Community claims that it is established in over 190 countries[25][34] of the world in all six continents and is the only sect of Islam to have translated the Qur’an into over 118 languages.[35] These include translations in German, Spanish, Swahili, French, Russian, Norwegian, Italian, Dutch, Gurmukhi, Persian, Pashto, Japanese, Tamil and Chinese.[36] The most famous translations of the Qur’an done by an Ahmadi author are the Tafseer-e-Sagheer and Tafseer-e-Kabeer which are Urdu translations of the Qur’an with commentary done by the Second Khalifa of the Ahmadiyya Muslim Community, Mirza Bashir-ud-Din Mahmood Ahmad. Tafseer-e-Sagheer is the smaller commentary while Tafseer-e-Kabeer is the larger ten volume commentary, an english rendering of the Tafseer-e-Kabeer consists of five-volumes. The first Muslim author of an English translation of the Qur’an was an Ahmadi, Maulana Muhammad Ali. In the year 1980, the Ahmadiyya Community living in the city of Calgary, in Canada, distributed copies of the Qur’an to Inuit communities in the Arctic Circle near the North Pole.[37]
(Note that the article refers to Qadianism as a "sect of Islam" which reveals the poor scholarship and obvious Qadiani bias.)