Analysis of information sources in references of the Wikipedia article "Ислам в Азербайджане" in Russian language version.
The same roughly 50:50 ratio still appears in the statistics of 1848, but figures for the 1860s indicate that the proportion of Sunnis had markedly declined. It stabilized subsequently at the level by which the Shi'ite Twelvers of the Jafarite rite held a clear majority of 2:1 among the population as the whole. The decrease in the proportionate strength of the Sunni element was the result of their emigration to Turkey, a trickle that turned into a torrent after the final suppression of Daghestan by Russia.
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