A drop in the bucket /a drop in the ocean

A drop in the bucket
Meaning
A very small proportion of the whole.
A drop in the bucket' is the predecessor of 'a drop in the ocean', which means the same thing. This is first found in a piece from The Edinburgh Weekly Journal, July 1802:
The votes for the appointment of Bonaparte to be Chief Consul for life are like a drop in the ocean compared with the aggregate of the population of France."