According to the OISM website, anyone with a Bachelor’s, Master’s, or Doctorate of Philosophy in a field related to physical sciences is qualified as a scientist.  there were over 10.6 million science graduates as defined by the OISM since the 1970-71 school year. This is a conservative estimate as illustrated by the 242,000 graduates in biological and biomedical sciences from 1950-51 through 1969-70 alone, never mind the 166,000 engineering graduates, and so on. Many of these individuals are still alive today and would be considered scientists according to the OISM definition thereof.

In other words, the OISM signatories represent a small fraction (~0.3%) of all science graduates, even when we use the OISM’s own definition of a scientist.