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nacka:
  s/(\d)(?=(\d{5})+(?!\d))/${1}-/g;
...
artist/nacka hybrid:
  s/((.){5})(?!$)/$1-/g;
  substr($_, 17, 1, '<br>');

                   Rate    artist    thezip artist/nacka nacka/artist 
+     nacka
artist       13175231/s        --       -8%          -9%         -14% 
+      -14%
...
artist/nacka 14534884/s       10%        1%           --          -5% 
+       -6%
nacka/artist 15313936/s       16%        7%           5%           -- 
+       -0%
nacka        15384615/s       17%        7%           6%           0% 
+        --