anchor.diff:  "GRC","GR","Greece",2010,3,3
   "GRC","GR","Greece",2011,2,2
   "GRC","GR","Greece",2012,1,0
  -"GRC",NA,"Greece",2013,NA,3
  +"GRC","GR","Greece",2013,NA,3
   "HUN","HU","Hungary",1975,0,0
   "HUN","HU","Hungary",1976,4,4
   "HUN","HU","Hungary",1977,3,3
  
positive.code: "ROM","RO","Romania",2010,4,2
  "ROM","RO","Romania",2011,3,1
  "ROM","RO","Romania",2012,2,0
  "ROM",NA,"Romania",2013,NA,3
  "SVK","SK","Slovakia",1975,NA,NA
  "SVK","SK","Slovakia",1976,NA,NA
  "SVK","SK","Slovakia",1977,NA,NA
  
negative.code: "AUT","AT","Austria",2010,0,3
  "AUT","AT","Austria",2011,3,2
  "AUT","AT","Austria",2012,2,1
  "AUT","AT","Austria",2013,NA,0
  "BEL","BE","Belgium",1975,3,3
  "BEL","BE","Belgium",1976,2,2
  "BEL","BE","Belgium",1977,1,1
  