Should I use 'an' YOY or 'a' YOY or can i use without 'an' or 'a'?

The bank, which was ranked 30th in terms of profit, reported 44.84 percent year-on-year (YOY) decrease in profit at Rs4,254.24 crore. The bank was ranked third in terms of assets with a YOY increase of 9.55 percent at Rs11,64,853.75 crore,

In the above paragraph, in the second sentence I used 'a YOY'. I have a doubt should it be 'an YOY' or can I just ignore both 'an' and 'a'

The doubt pertains to, if we pronounce YOY as year-on-year, then it sounds like vowel. But if we pronounce YOY as why-o-why, then it doesn't sound like vowel

Solution 1:

If you say YOY as "year on year" then it starts with a /j/ sound [that's the IPA j, not the English J which is IPA /dʒ/]. The /j/ sound is consonantal.

If you say YOY as an initialism, "why-oh-why", then it starts with a /w/ sound. The /w/ sound is consonantal.

If you say YOY as its own single word, /jɔɪ/, then it starts with a /j/ sound. The /j/ sound is consonantal.

Thus the correct article for YOY is always a and never an.