I want to know about yearly subscription plans
iCloud storage subscription annual plan
MacBook Air 13″, macOS 10.15
Question marked as
There is no yearly option.
Apple discontinued the yearly plans in favor of monthly ones. If you had a yearly option it continues to be billed yearly unless you change to a monthly option.
If you are not currently using iCloud Storage in a yearly plan, you cannot get a yearly plan.
More details here: iCloud storage plans and pricing - Apple Support