Exactly. The important numbers are the gender share of this year's STEM graduates with this year's gender share of STEM job applications and this year's gender share of STEM job placements.
Eg, for 30 years the NHS has had about 50/50 male/female recruitment, but it's only in the last few years that the workforce as a whole has got close to 50/50, because it takes 40+ years for the 90%/10% proportion who entered the profession 40 years ago to die off or retire.