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Reminder -- when giving decades of time, there is never an apostrophe before the "s." However, if truncating the decade, an apostrophe does take the place of the dropped century numerals.
These sign makers did it right!
When making acronyms, initial-isms or abbreviations plural, no apostrophe is required -- IRAs, RFPs, CDs, FAQs, NSAIDs.
Note that these are all multi-letter names that are treated as nouns in every way, including in their plural form.
The exception is when discussing multiple occurrences of a single letter of the alphabet, like so: "Mary's handwriting has improved; her e's are now distinct from her i's."
This exception is important when you consider that the apostrophe makes it clear that it is a letter of the alphabet under consideration, and not the word, "is."
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