According to heraldic sources total number of legal ennoblements issued between the 14th century and the mid-18th century, is estimated at approximately 800. This is an average of only about two ennoblements per year or only 0.000 000 14 – 0.000 001 of historical population. Compare: historical demography of Poland.
Around what time was the total legal number of ennoblement at 800? What is average for ennoblements between 14th and min 18th century. What type of sources give information regarding total number of enablements?