Autogram programs

This sentence employs two a’s, two c’s, two d’s, twenty-eight e’s, five f’s, three g’s, eight h’s, eleven i’s, three l’s, two m’s, thirteen n’s, nine o’s, two p’s, five r’s, twenty-five s’s, twenty-three t’s, six v’s, ten w’s, two x’s, five y’s, and one z.

Such sentences are called autograms. Your task is to write a program or function that has a similar property: it takes as input a byte, and outputs an integer representing the number of times that byte appears in the program's source code. It should output 0 if its input doesn't appear in its source.

Your program must not read its own source code, directly or indirectly, but instead all the data it needs to give its output must be hard-coded, quine style. Your program must be at least one byte in length.

This is , so the shortest entry (in bytes) wins. I won't accept an answer, so feel free to compete for the shortest solution in your favourite language.

You are strongly encouraged to include an explanation in your post.

Below are leaderboards both for overall score and per language:

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• Sandbox. (It's been in there since 2014!) – Nathaniel Apr 16 '18 at 13:01
• Are functions allowed, or only full programs? – Uriel Apr 16 '18 at 13:08
• Note: Answers similar to this one doesn't count as valid anymore. – user202729 Apr 16 '18 at 14:13
• FWIW, the proper quine definition is a bit stronger than I would really like for this challenge. For example, I would be quite happy to see a program that uses all the characters in some contiguous range, and just outputs a 1 if its input is in that range, even though this doesn't have "a section of the program which encodes a different part of the program". For that reason I'd have been willing to allow the retina example, though it would have been disappointing if it had put others off from posting, due to already just being 1 byte. (@user202729) – Nathaniel Apr 16 '18 at 14:31
• Because of my above comment, I've removed the statement that quine rules apply. (I've kept the part about not reading the source code.) – Nathaniel Apr 16 '18 at 14:44

'0d3*{:}=+l2=?n\$40.

Takes input via the -s flag. Uses the standard ><> quine format, counting how many occurrences of the character are present in the program.