I’m curious why you are downvoted?
When searching “wireless charging efficiency” on Google, Google offer this short explanation:

The efficiency rate of inductive chargers usually falls between 70% and 80%, though some newer models boast efficiencies closer to 90% under optimal conditions. This is slightly lower than the 90% to 95% efficiency rate often seen in traditional wired charging.

Not too far off from the statement above, and apparently progress is being made.