anchor.diff:              "seq_no": 1,
               "code": 11,
               "title": "Agriculture, Forestry, Fishing and Hunting",
  -            "change_indicator": 0,
               "trilateral": 1
           },
           {  ...  }
  
positive.code: < 200
  < Content-Type: application/json
  {
      "seq_no": 1475,
      "code": 519120,
      "title": "Libraries and Archives",
      "change_indicator": 0,
      "trilateral": 0
  }
  
  Get all NAICS codes above in the hierarchy of the requested code.
  
negative.code: --
  Retrieving NAICS codes
  How to get codes, and information related to that code
  
  #### Fields
  * __seq_no__ This is a sequence number provided by NAICS and appears to be used as primary key by some agencies. Do not use this except for backwards-compatibility with other databases or software.
  * __code__ This is the 2-6 digit NAICS code.  Always use this when referring to NAICS by code.
  * __title__ This is the name of the NAICS code.
  * __change_indicator (2012 NAICS only)__ If present, indicates whether this code changed from the previous (2007) NAICS.
      * __1 = title changed__ from 2007 NAICS, but no content has changed.
      * __2 = new code__ in 2012 NAICS.
      * __3 = content changed__ from 2007 NAICS, and title may or may not have changed.
  * __trilateral (2012 NAICS only)__ If present, indicates that there is a trilateral agreement between Canada, Mexico, and the United States to use a comparable definition of this industry for this code.
  * __description (to-do)__ If present, this is the text description of this NAICS Code provided by the NAICS Definition File.
  * __crossrefs (to-do)__ If present, this is an array of cross-references to other NAICS codes that should be used to fine-tune a business classification, provided by the NAICS Definition File.
  * __keywords (to-do)__ (6-digit codes only) If present, this is an array of other titles that belong under this NAICS code, provided by the NAICS Index File. Very useful as a keyword search to determine where specific businesses should be classified. 
  
  --
  
  Get all NAICS codes for a given year (only 2007 and 2012 are available right now.)
  