Just came across this table, and set of graphs, on the DES website.
It's contained within the 'Report from the National Standardisation Group to the Independent Steering Committee and the Programme Board'. The full thing is available here. I'm just copying over the section that relates specifically to physics.
This is on page 143 of the document.
And finally, my own graph showing attainment in 2019, from the SEC figures. Just for comparison.