The Resolution Foundation has just updated its quarterly earnings outlook data. These two graphs come from their microsite on this subject:
The latter, for the record, shows the number of staff receiving off the job training in the previous four weeks on a rolling average basis. This was 10.1% in December 2000 and 6.9% in September 2016.
If you want an explanation for the first graph it's in the second. We just don't invest enough in people in this country.