get https://api.workforce.pearson.com/di/v1/industries//skills/declining
Return declining skills for a given {industry_id} in a given {country_code}(default: US).
Skills that have a negative gradient (i.e. a declining rate) for the given industry and are within the top 5% of all skill-industry combinations are identified as declining skills for the industry.
Note that some industries might not have any declining skills.