I want to know the answer to the following question:
How much did the mortality rate of common bacterial infections decline between 1946-1955?
All the background I'm provided with is that "The report found that over the period 1946-1955, there was a 42% drop in the incidence of diseases for which antibiotics were effective and only a 20% drop in those for which antibiotics were not effective.". Is that enough to answer the question?