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Because steem_per_mvests growth at https://steemit.com you can see that your Steem Power growth because https://steemit.com shows it in STEEMs, but real SP value still same, if you want to know your real SP please check here: https://steemd.com/@beervangeer

SP doesn't grows dayly automatically, it's grows only when you receives rewards for your posts or your curation, and looks like:

beervangeer author reward: 51.743 SBD and 1.058M VESTS for @beervangeer/what-when-steemit-hits-africa… 18 hours ago

im not talking about the rewards. the SP is also growing, even when you are not active, but just holding SP

steem_per_mvests is growing constantly. Every day you will get a little bit more steem for your SP.

yes i can see that, but HOW fast and how much , thats te question

From the whitepaper:

Because Steem wants to encourage long-term growth, it is hardwired to allocate 9 STEEM to Steem Power (SP) stakeholders for every 1 STEEM it creates to fund growth through contribution incentives. Over time this drives the ratio of the total STEEM value of Steem Power balances to the total of STEEM balances toward 9:1 . (It seems likely that the ratio will be somewhat greater than 9:1 due to continued net Powering Up of the newly printed STEEM.) It also means that long-term holders are almost completely protected from the dilution used to fund growth