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Yes but it has not dropped more than 20% and now stable but it is still going down.

Lets say if the steem value increase 100% in next month (example only) . Then reward and voting power will increase? As my voting value decresed from $0.10 to $0.07 now

The rewards will change based on the STEEM price, so yes :)

There are other factors though, so if STEEM drops 20%, it doesn't mean your rewards will drop by exactly 20%.

Thanks mate with explanation

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