| en nb | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| + 60 | 525 | 531 | 534 | 572 | 555 | 571 | 561 |
| 50 - 60 | 435 | 462 | 438 | 427 | 372 | 355 | 388 |
| 40 - 50 | 469 | 498 | 469 | 447 | 392 | 368 | 349 |
| 30 - 40 | 413 | 348 | 313 | 269 | 245 | 225 | 194 |
| 20 - 30 | 249 | 258 | 249 | 204 | 171 | 168 | 179 |
| 10 - 20 | 235 | 215 | 205 | 194 | 154 | 143 | 157 |
| - 10 | 17 | 27 | 25 | 20 | 22 | 29 | 23 |
| total | 2343 | 2339 | 2233 | 2133 | 1911 | 1859 | 1851 |
| en % | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| + 60 | 22,41 | 22,70 | 23,91 | 26,82 | 29,04 | 30,72 | 30,31 |
| 50 - 60 | 18,57 | 19,75 | 19,61 | 20,02 | 19,47 | 19,10 | 20,96 |
| 40 - 50 | 20,02 | 21,29 | 21,00 | 20,96 | 20,51 | 19,80 | 18,85 |
| 30 - 40 | 17,63 | 14,88 | 14,02 | 12,61 | 12,82 | 12,10 | 10,48 |
| 20 - 30 | 10,63 | 11,03 | 11,15 | 9,56 | 8,95 | 9,04 | 9,67 |
| 10 - 20 | 10,03 | 9,19 | 9,18 | 9,10 | 8,06 | 7,69 | 8,48 |
| - 10 | 0,73 | 1,15 | 1,12 | 0,94 | 1,15 | 1,56 | 1,24 |
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