Calculate the difference between a previous value and a following value in Access [closed]

Good, I need to perform a calculation that brings me the difference between a current value and a previous value .....

The schema would be the following:

Fecha | Costo | Diferencia
15/02 | 1500  |  0
17/02 | 1600  |  100
19/02 | 1500  |  100
20/03 | 1500  |  0
:
: 

The difference column is the one I want to obtain, which would be the difference between the values in the Cost column.