The way the buckets are structured over the years has changed.
Looking at the history of https://web.archive.org/web/20221003111240/https://www.bls.g... and the 15-xxxx set shows a change in how the BLS regarded the various fields. If you go far enough back, there were computer programmers, software developers (systems), and software developers (applications) as the three buckets.
The most interesting part (to me) has been how the web has been moved in and out of different buckets.
The total number of software developers has gone up so much that I fear that its going to start dragging up the salaries of peer-occupations like Civil Engineering, which are fairly easily retooled as junior software developers, as the demand starts to outstrip relative supply.
The BLS predicted 30% growth, but it looks like growth in number of positions from 2010-2022 was 77%.
The old figure only included software developers. The new figure includes QA and testers.