This is obnoxious, but why do they report the percentage improvement, but not the actual yield? If it is 35% improvement, it would be nice to know what it was

This is obnoxious, but why do they report the percentage improvement, but not the actual yield? If it is 35% improvement, it would be nice to know what it was an improvement on. One of the linked sources suggests that current maximums on PV efficiency are around 24% of total sun energy converted to electricity out of a maximum of 33.7%. so, if that is the case then does this get us from 24% to 32%, or very close to the maximum solar electricity extraction per area? Please double check my math or correct me where I'm wrong, but putting everything in marginal terms is very confusing.