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* A “skills gap” is defined by the source as when an employee is not fully proficient, i.e. is not able to do their job to the required level.

** Base in 2011 was 86,522, base in 2013 was 91,279, base in 2015 was 91,210.

Methodology and background note (from source):
To ascertain the number of staff with skills gaps, respondents were asked, for each major (one-digit SOC 2010) occupation where they employed staff, how many of those they employed were fully proficient. If respondents asked for clarification, then a proficient employee was described as ‘someone who is able to do their job to the required level’.