| Maintenance of roads, total | 
  107.8 | 
  109.0 | 
  110.5 | 
  111.7 | 
  112.4 | 
  113.1 | 
  115.5 | 
  118.0 | 
  122.0 | 
 8.5 | 
 3.4 | 
 | Maintenance of roads, total, materials | 
  117.0 | 
  119.2 | 
  122.7 | 
  121.9 | 
  119.3 | 
  117.7 | 
  125.0 | 
  128.9 | 
  135.0 | 
 13.2 | 
 4.7 | 
 | Maintenance of roads, total, machinery1 | 
  105.2 | 
  106.3 | 
  106.7 | 
  109.0 | 
  108.3 | 
  110.2 | 
  111.0 | 
  114.2 | 
  120.1 | 
 10.9 | 
 5.2 | 
 | Maintenance of roads, total, labour costs | 
  104.9 | 
  104.8 | 
  106.0 | 
  107.6 | 
  111.2 | 
  112.9 | 
  115.2 | 
  116.9 | 
  119.6 | 
 7.6 | 
 2.3 | 
 |   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 | Asphalt work | 
  114.1 | 
  116.4 | 
  119.4 | 
  119.4 | 
  118.0 | 
  116.1 | 
  122.1 | 
  125.9 | 
  132.1 | 
 11.9 | 
 4.9 | 
 | Asphalt work, materials | 
  125.2 | 
  128.8 | 
  134.0 | 
  132.2 | 
  127.3 | 
  122.1 | 
  134.0 | 
  139.7 | 
  149.2 | 
 17.2 | 
 6.8 | 
 |   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 | Maintenance in wintertime | 
  106.1 | 
  107.2 | 
  108.2 | 
  109.9 | 
  110.6 | 
  112.0 | 
  112.5 | 
  115.0 | 
  118.4 | 
 7.1 | 
 3.0 | 
 | Maintenance in wintertime, materials | 
  103.1 | 
  103.7 | 
  106.0 | 
  105.4 | 
  105.9 | 
  107.1 | 
  106.7 | 
  107.4 | 
  109.2 | 
 3.1 | 
 1.7 | 
  |