What information is available on EPM to APM comparisons?

I've been looking for information on EPM it relates to APM statistically (fractions/percentages/ratios) of APM. Information desired would include:

• EPM and APM combined, across leagues. This could show minimal requirements for EPM, as well as the typical level of APM required for a given EPM within a league.
• EPM and APM combined of some professional players. This would allow a more objective comparison between two professional players, as well as between professional players and non-professional players.
• EPM and APM combined, across a wide APM band. This would potentially answer such questions as: "How does EPM as a percentage of APM vary as APM increases?"

I am NOT looking for:

• What is the difference between EPM and APM?

• The value or usefulness of EPM or APM as a measurement.