all of which的用法

Even rates of participation in walking and cycling are declining. All of which suggests we should be marched to the nearest gym.

这句话中的all of which为什么用which，是什么用法？为什么在两个句子中？

网友句子明显错误，改为：

Even rates of participation in walking and cycling are declining, all of which suggests we should be marched to the nearest gym.

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

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