Here is a short Bloomberg article from Oct 2021, which I believe is when the current record for US remittances to Mexico was set.

Remittances to Mexico Top Estimates, Signal Record as U.S. Booms

Money sent from abroad hit $4.74 billion in August, a new high

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Remittances sent to Mexico reached another record in August, a sign that contributions from workers in the U.S. continue to help Latin America’s second-largest economy while its recovery remains uneven. . . .

The U.S. economic recovery and stimulus payments have allowed Mexican workers abroad to send a growing amount of their income and savings back home. Each transfer has averaged $387 in August, the central bank said.

https://www.bloomberg.com/news/articles/2021-10-01/remittances-to-mexico-can-t-stop-growing-thanks-to-u-s-boom