understanding routing table "Bit" field
In "show bgp neighbor" output there is a following informational line: "Table inet.0 Bit: 10000". For some other BGP neighbors the "Bit:" field has the same value, for some others, it's 10001, 10004, 20000. According to documentation "Bit:" filed represents the entry in the routing table for this peer. How to understand this? And why the values aren't unique? 