Hi. I'm trying to achieve a few objectives

Track the quantities sold for each item in our inventory by year.

Track the difference in quantity sales between months of Year 1 and Year 2

```
Data
Order Number Order Date Item Quantity Category
A12345 4 Jan 2014 Pencil 5 Stationery
A12346 16 Jan 2014 Pencil 5 Stationery
A12347 2 Feb 2014 Pencil 20 Stationery
A12348 5 Feb 2014 Pencil 40 Stationery
---------------------------------------------------------------------------
A12351 15 Jan 2015 Pencil 15 Stationery
A12352 21 Jan 2015 Pencil 5 Stationery
A12353 11 Feb 2015 Pencil 30 Stationery
A12354 2 Mar 2015 Ruler 20 Stationery
A12355 12 Mar 2015 Ruler 20 Stationery
Search Parameter
SET @Year1 = 2014
SET @Year2 = 2015
Search Results
Item 2014 2015 Change
Pencil 70 50 -28.6%
Ruler 0 40 4000.0%
```

Any help is much appreciated.