I have found a Kiev-90 manual guide with paper insert recently. The insert has hand-written information in Russian language:

http://www.ussrphoto.com/UserContent/kiev-90_3.jpg
I will try to translate the matter of this text: "starting from year 1986 appr. 100-150 Kiev-90 cameras were released per year".
May be any of you could confirm or to deny these numbers? Thanks in advance!
Best Regards,
Aidas