After the Kusama v0. 20 upgrade, the parachain block time has been greatly reduced from around 24s to 15s.

14 May 2022, 18:21
After the Kusama v0.9.20 upgrade, the parachain block time has been greatly reduced from around 24s to 15s. So we apply a proposal to adjust the tokenomic parameter to match the 15s block time, and the block_subsidy will be reduced from 183.3 to 125 (100 PHA * 15s / 12s). The proposal will be closed at #1622867, Here is the link to vote for it: