CME ES margins

Does anyone know how often they evaluate the margin requirements for the ES? Seems like a no-brainer they should lower margins considering the volatility is this low.
 
Does anyone know how often they evaluate the margin requirements for the ES? Seems like a no-brainer they should lower margins considering the volatility is this low.

The notional value is getting higher though, and volatility can return in a flash.
 
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