が減った

decreased; became fewer or less

→ が
phrase Rare #42,679
decreased; became fewer or less Used after the thing that decreased. It describes a reduction in number, amount, or degree.
JA: 今年は昨年より事故が減った。
EN: There were fewer accidents this year than last year.

今年は昨年より事故が減った。

There were fewer accidents this year than last year.

殺人事件が減ったな

The number of murder cases has gone down.

— 別れる決心 (2022)

笑顔が減ったぞ

You’re smiling less these days.

— 帰ってきたヒトラー (2015)