PI Datalink - data filtering

Hi,

I want to retrieve a list of PI data points without the same data value for example:

Original list:

Timestamp                    Value

-------------------------     -----------------------

01-JUL-13 00:00:01     1

01-JUL-13 00:00:03     1

01-JUL-13 00:00:04     1

01-JUL-13 00:00:05     2

01-JUL-13 00:00:06     1

01-JUL-13 00:00:07     3

01-JUL-13 00:00:08     1

01-JUL-13 00:00:09     1

Expected result: (get the changed data points only)

Timestamp                    Value

-------------------------     -----------------------

01-JUL-13 00:00:01     1

01-JUL-13 00:00:05     2

01-JUL-13 00:00:06     1

01-JUL-13 00:00:07     3

01-JUL-13 00:00:08     1

Can I achieve the above result through PI datalink? or VBA?

Thanks in advance for any help.