What changes in the composition of the urban and rural population took place in the 16-17 centuries?

The urban population in the 17th century was only 3% of all people. This was due to the fact that Russia continued to be an agrarian country, and most people were engaged in agriculture, the centers of which were in the villages. In the 17th century, the peasants were divided into black moss, who still retained some freedoms, and serfs, who were completely dependent on the owners. Since the 17th century, serfs were allowed to be “pulled out” from their families, sold, donated, exchanged.