Silviculture

5   Drainage and fertilizing of forest area1. 1991-2002
  Drainage Area drained, new ditches Area fertilized
  New ditches Cleaning of ditches and supplementary ditching Mineral soil Boggy land
  km km2
1991 1 716  862 30 27 13
1992 1 233  554 22 21 20
1993  908  451 17 15 13
1994  683  486 13 14 13
1995  413  408 8 14 13
1996  339  361 8 21 9
1997*  271  317 5 18 5
1998*2  323  364 7 20 6
1999*3  311  268 6 18 8
2000*  213  294 4 13 4
2001*  175  215 4 11 3
2002*  167  212 4 14 1
1  The figures only comprise work financed with forest trust fund or government subsidies.
2  Figures for Finnmark are missing.
3  Figures for Troms are missing.

Explanation of symbols