Here's a quick solution, although it will not provide auto numbering.

Open a new Excel document. enter 10, 20, 30 in the first three rows, respectively, of column A. Select the cells, right-click and drag down the lower right hand corner of the 30 cell about 50 cells and release. Select "Fill series." You'll have a list by increments of 10.
Copy as many cells as you have rows in your table, and switch to your Word document. Select the all cells in column in which you want the list, and simply paste.

Does this do the trick for you?