Finding # of Occurrences in various cells.

[The Exceller]

I have attached a spreadsheet which has various codes typed into a number of cells.

I am trying to find the number of occrrences for certain codes that appear in these cells. The problem is that the codes in the cells look as follows:

cell A13: 272.4;789.01;787.23;401.9;274.9;2725
cell A18: 530.3;787.20;041.86;578.1;455.6;565.0


That appears in one cell itself and the codes are separated by a semicolon.

What I need to do is find the number of occrrences that a certain code occurs. For example, how many times does 787.20 (from above) occur in the entire list from cell A5:A164?

It is difficult to siphon out certain numbers because they are all lumped together and separated by the semicolon.

I've attached the spreadsheet for ease of understanding.

I've tried to use the =countif function but it won't pick up everything it should because of the semicolon problem and the numbers being lumped together.

Any help is much appreciated!