This looks like a good overview, although they mix futures contract with options contracts and I cannot get good idea of their options-only contract volumes. At least you can get ideas what to look at:
https://fia.org/articles/fia-releases-half-year-data-futures-and-options-volume-trends-0
https://fia.org/articles/fia-releases-half-year-data-futures-and-options-volume-trends-0
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