Where can I find sources for statistics and research on the number of online stores and areas of goods for sale?

Question

Online shopping

To analyze the market, it is necessary to determine the growth rate of the number of online stores over the past 3-5 years in the Russian Federation, the CIS, the World. How many online stores were opened.
The second question for statistics is what kind of goods are most often sold through online stores, where there is more competition.
Share where to find such information and whether it is available on the Internet :)

Answer 1

Payment systems sometimes publish similar statistics for their customers.
In particular, Payoneer published anything interesting (of course impersonal) about private traders - geography, specialization, amounts, etc.
For shops, if anyone has objective information, then only they, payment systems.

Answer 2

in Finam

Answer 3

Yandex research has information about online commerce.