Interesting Number Pattern --> 2

See this sequence

99 x 99 - 8901
89 x 89 - 7921
79 x 79 - 6241
69 x 69 - 4761
59 x 59 - 3481
49 x 49 - 2401
39 x 39 - 1521
29 x 29 - 0841
19 x 19 - 0361
9 x 9 - 0081

Note the last 2 digits from top to bottom - They follow the same pattern and difference is the same :)