Calculate the variance/difference of single property values.

Hi, Please help me to understand if there is any way to calculate the variance/difference between present and previous row value of same property values(Numbers/dates) using pipeline pilot. 

Thanks for your help in advance !

Sanjeev

InputOutput
01(1-0)
11(2-1)
21(3-2)
32(5-3)
52(7-5)
73(10-7)
102(12-10)
120/null