https://www.cnbc.com/2019/05/24/measles-infected-up-to-4-million-a-year-in-us-before-vaccine.html
A report on the effect vaccines had when measles was prevalent. Information here shows a large drop of measles cases from 700,000 cases to well below 30,000 when a vaccination was introduced. Further along the time period shows a near plateaued line going along 0.
The effect of vaccinations is real people!