Sort:  

https://steemit.com/steem-help/@jerrybanfield/steemit-updates-summarized-from-launch-to-19-0

It's part of the quote I used above, but goes into more detail (which is what you are looking for)

It's not a fixed rate. It's a percentage that can change. In general holding steem power always means your power increases the majority of the time. Read that blog post for more.

Coin Marketplace

STEEM 0.06
TRX 0.28
JST 0.048
BTC 72365.76
ETH 2116.57
USDT 1.00
SBD 0.45