I have a large spreadsheet that has four columns. Whta this spreadsheet is
contains the number of customers in each area and each breakdown of the hour.
What I have done is sorted by date and hour. What I would like to do is
place the sum of the customers for each hour in a column. Is this possible?

Customers Area Date Hour
38 01 01/01/05 3
85 02 01/01/05 3
33 03 01/01/05 3
18 04 01/01/05 3
28 05 01/01/05 3
48 06 01/01/05 3
14 07 01/01/05 3
47 08 01/01/05 3
29 09 01/01/05 3
9 22 01/01/05 3
13 23 01/01/05 3
18 24 01/01/05 3
9 25 01/01/05 3
103 01 01/01/05 4
168 02 01/01/05 4
109 03 01/01/05 4
62 04 01/01/05 4
76 05 01/01/05 4
163 06 01/01/05 4
54 07 01/01/05 4
148 08 01/01/05 4
89 09 01/01/05 4
29 22 01/01/05 4
58 23 01/01/05 4
57 24 01/01/05 4
24 25 01/01/05 4
73 01 01/01/05 5
144 02 01/01/05 5
80 03 01/01/05 5
55 04 01/01/05 5
62 05 01/01/05 5
130 06 01/01/05 5

Date 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00
03/20/05 227 669 502 527 714 1105 1450 1747 2141 2265 2563 2648 2730 2729