anchor.diff:  "Mauritania",MR,1993,34.5164536105674
   "Mauritania",MR,1992,31.576069502249
   "Mauritania",MR,1991,30.542149573706
  -"Mauritania",MR,1990,22.3167074051894
  -"Mauritius",MU,2015,16.4064769784779
  -"Mauritius",MU,2014,16.415298931332
  -"Mauritius",MU,2013,16.3986065645753
  -"Mauritius",MU,2012,16.146636981392
  +"Mauritania",MR,1990,22.3167074051893
  +"Mauritius",MU,2015,16.1486537301839
  +"Mauritius",MU,2014,16.1684453158936
  +"Mauritius",MU,2013,16.2177907679909
  +"Mauritius",MU,2012,16.0385089241446
   "Mauritius",MU,2011,15.9409193927696
  -"Mauritius",MU,2010,15.6553437180046
  -"Mauritius",MU,2009,15.5690532632082
  -"Mauritius",MU,2008,15.7053937701287
  -"Mauritius",MU,2007,15.0286081352374
  -"Mauritius",MU,2006,14.2915835274137
  -"Mauritius",MU,2005,13.2966293826837
  -"Mauritius",MU,2004,13.1638253106559
  -"Mauritius",MU,2003,12.7492877369686
  -"Mauritius",MU,2002,12.300564272664
  -"Mauritius",MU,2001,11.7987163610962
  -"Mauritius",MU,2000,11.2676163620191
  -"Mauritius",MU,1999,11.2885364509085
  -"Mauritius",MU,1998,10.8861633782337
  -"Mauritius",MU,1997,10.2877727914077
  -"Mauritius",MU,1996,9.95412083084547
  -"Mauritius",MU,1995,9.47256553818209
  -"Mauritius",MU,1994,9.17442021277766
  -"Mauritius",MU,1993,8.79322999844293
  -"Mauritius",MU,1992,8.24247020228692
  -"Mauritius",MU,1991,8.00183146216541
  -"Mauritius",MU,1990,7.61592444847259
  +"Mauritius",MU,2010,15.7714318850794
  +"Mauritius",MU,2009,15.7862370133829
  +"Mauritius",MU,2008,16.0108664068114
  +"Mauritius",MU,2007,15.4465402515809
  +"Mauritius",MU,2006,14.6411885422258
  +"Mauritius",MU,2005,13.6219108169133
  +"Mauritius",MU,2004,13.4858578990481
  +"Mauritius",MU,2003,13.0611793059618
  +"Mauritius",MU,2002,12.6014785174166
  +"Mauritius",MU,2001,12.0873536743241
  +"Mauritius",MU,2000,11.5432611367286
  +"Mauritius",MU,1999,11.5646930031762
  +"Mauritius",MU,1998,11.1524764967704
  +"Mauritius",MU,1997,10.539447211466
  +"Mauritius",MU,1996,10.1976329726946
  +"Mauritius",MU,1995,9.7042971759839
  +"Mauritius",MU,1994,9.39885818718063
  +"Mauritius",MU,1993,9.00834274492051
  +"Mauritius",MU,1992,8.44410946377416
  +"Mauritius",MU,1991,8.19758386975419
  +"Mauritius",MU,1990,7.80223623894853
   "Mexico",MX,2015,8.264422
   "Mexico",MX,2014,7.926993
   "Mexico",MX,2013,8.015469
  
positive.code: "Morocco",MA,1992,4.08883744990255
  "Morocco",MA,1991,3.99859394279865
  "Morocco",MA,1990,3.92014428486936
  "Mozambique",MZ,2015,17.7018511691828
  "Mozambique",MZ,2014,17.188361883537
  "Mozambique",MZ,2013,17.0361108538673
  "Mozambique",MZ,2012,16.661113957886
  "Mozambique",MZ,2011,16.0295526642596
  "Mozambique",MZ,2010,15.832930088537
  
negative.code: "Benin",BJ,2001,201.089411198257
  "Benin",BJ,2000,201.694465163265
  "Benin",BJ,1999,197.707387662926
  "Benin",BJ,1998,184.933588856266
  "Benin",BJ,1997,177.646812991333
  "Benin",BJ,1996,174.294960989645
  "Benin",BJ,1995,166.010009744289
  "Benin",BJ,1994,147.240007604014
  "Benin",BJ,1993,111.362915655669
  "Benin",BJ,1992,111.363937780144
  "Benin",BJ,1991,110.558006705544
  "Benin",BJ,1990,113.380087825371
  "Bermuda",BM,2013,1.63528822133496
  "Bermuda",BM,2012,1.60945693471431
  "Bermuda",BM,2011,1.56358868705359
  "Bermuda",BM,2010,1.59639095344713
  