Count number of value present in a column?

[#1]

Hello,

I have a file with different column : Timestamp field, number1, number2, number3, number4.  I am loading this file and create a Cross table

Cross table :

03-09-2012 00:04:15	6360	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:09:18	6093	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:14:22	6329	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:19:26	5951	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:24:30	6280	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:29:34	6079	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:34:40	6548	qmem://<bundled>/BuiltIn/led_o.png	warning
03-09-2012 00:39:43	6189	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:44:47	5982	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:49:51	6297	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:54:55	6484	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 00:59:59	6218	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 01:05:03	6139	qmem://<bundled>/BuiltIn/led_g.png	green
03-09-2012 01:10:07	6781	qmem://<bundled>/BuiltIn/led_o.png	warning
03-09-2012 01:15:11	6998	qmem://<bundled>/BuiltIn/led_o.png	warning
03-09-2012 01:20:15	6906	qmem://<bundled>/BuiltIn/led_o.png	warning
03-09-2012 01:25:20	7139	qmem://<bundled>/BuiltIn/led_r.png	error

- column2 : expression = number1+number2+number3+number3

- column4 : depending of the value in the column 2 I display : green, warning or error (threshold value)

=if (num(Column(1)) < warningv,'green',

if (num(Column(1)) < errorv,'warning',

if (num(Column(1)) > errorv,'error',Null())))

Now from this cross table I would like create a graph representing the number of percentage of green, warning and error.

Could you help me how can I do it please?

thks

Valery