Earlier quoted context omitted.
H1B petitions in computer occupations are predominantly in software development and computer programming. About 30% are for "computer systems analyst" or "computer occupations, other" but I don't really buy most of those petitions aren't actually for devs. All software developers on TN visas (NAFTA/USMCA visas) are officially "computer systems analysts" for example.
Not sure where are you getting 32% from. The table on p. 15 has "Systems Analysis And Programming" at 56% of all petitions. Other computer related occupations are 10.4% https://www.uscis.gov/sites/default/files/reports-studies/Ch...
So 86% of of "Systems Analysis And Programming" and "Computer Occupations, Other" are "Systems Analysis And Programming".
If you want to assume "Computer Occupations, Other" are not devs, which is not a good assumption in my opinion then fine only 86% are devs.