They accounted for 19% of banking transactions in the year to March 2019.

在截至2019年3月的一年里，它们占银行交易的19%。

It's used in banking transactions, in computer systems that control power grids and water supplies, even in government communications.

它用于银行交易、控制电网和供水的计算机系统，甚至用于政府通信。