Excel 2010 :: Lookup For Match Function

I think I need some version of a lookup for match function. Here is essentially what I need: I have a column of data points. I need to output every position at which the data point changes to a different value (going from top to bottom). See below for an example.

Here is some sample data (with column headers)

Position
Data Pt

1
-7.5

2
-8.0

[Code] .......

Here is the result I need (I want to put a consistent formula into the second column below that returns the results shown in the second column below):

split 1 position
2

split 2 position
4

[Code] ........

Is what I am describing possible? Because I am inserting this into a template, I ideally need to do this outside of any sort of VBA work.