According to the data from CryptoRank, aggregated monthly BTC Futures Volume on most of the major exchanges increased up to 100% in April 2021:

Binance – $2.14T +52%
Huobi Futures – $1.01T +26%
OKEx – $698B +100%
Bybit – $452B +22%
FTX – $373B +78%

Derivatives Analytics Tools 👉 https://cryptorank.io/derivatives-analytics/bitcoin