here ya go: https://www.bluetooth.com/blog/exploring-bluetooth-5-how-fast-can-it-be/

so, bt4 you get 1/3 mbit, 1mbit for 4.2 and 2mbit for 5... so that works out to ... about 56kbit for bt4, 100kbit for bt4.2 and ~ 250kbit for bt5