The top ten liquidation events were calculated based on the opening price of BTC on the day of the liquidation. The number one event was surprisingly May 19th, with 210,000 BTC liquidated. The following events, October 11th, April 18th, and March 12th, each saw liquidations of around 160,000 BTC. As you can see in the chart, 2021 was truly a difficult year. These events accounted for 7 out of the top 10.