The amount of Ether on centralized cryptocurrency exchanges has decreased by 38% since 2022. According to data provided by CryptoQuant; in September 2022, there were 28.8 million ETH, while currently there are 17.4 million ETH left on exchanges.

As a reminder, September 2022 was the period when the Ethereum network implemented the "merge" update. The network had transitioned from a mining system to a (staking) system. During that time, the price of Ether had actually fallen contrary to expectations. The increases seen before the "Merge" had given way to sell-offs after the renewal. That sell-off period had resulted in a massive influx of ETH to the exchanges.
CryptoQuant also stated that ETF demand plays a significant role in the outflow of ethers from exchanges. In July last year, the Ether spot ETFs approved by the SEC saw a net inflow of more than 13 billion dollars in about a year. It was noted that this situation is also effective in the outflow of ETH from exchanges.
The purchases of Ether by companies like BitMine and SharpLink have further increased this situation.