anchor.diff:  "LTU","LT","Lithuania",2010,4,2
   "LTU","LT","Lithuania",2011,3,1
   "LTU","LT","Lithuania",2012,2,0
  -"LTU",NA,"Lithuania",2013,NA,3
  +"LTU","LT","Lithuania",2013,NA,3
   "LUX","LU","Luxembourg",1975,4,4
   "LUX","LU","Luxembourg",1976,3,3
   "LUX","LU","Luxembourg",1977,2,2
  
positive.code: "GRC","GR","Greece",2010,3,3
  "GRC","GR","Greece",2011,2,2
  "GRC","GR","Greece",2012,1,0
  "GRC",NA,"Greece",2013,NA,3
  "HUN","HU","Hungary",1975,0,0
  "HUN","HU","Hungary",1976,4,4
  "HUN","HU","Hungary",1977,3,3
  
negative.code: "NLD","NL","Netherlands",2010,0,0
  "NLD","NL","Netherlands",2011,3,3
  "NLD","NL","Netherlands",2012,2,0
  "NLD","NL","Netherlands",2013,NA,3
  "POL","PL","Poland",1975,NA,NA
  "POL","PL","Poland",1976,NA,NA
  "POL","PL","Poland",1977,NA,NA
  