What year marks the origin of Methodological Individualism: the early framework of Max Weber, or the later coining of the term itself?

The source already cited on this entity credits Max Weber with introducing the individualist account of social action, and states that the economist Joseph Schumpeter is generally credited with coining the term methodological individualism itself in the early twentieth century, but names no specific year for either event, so origin-year cannot be assigned without picking a date the source does not give.