How to calculate the Percentage differencebased on two values

Not sure how to do this.
Just want to calculate the % difference of two values (seem to have a problem when one value is zero)
Here is the current output
49 Apr 2
64 Aug 1
55 Feb 0
Here is the output I would like to see
49 Apr 2 4.08%
64 Aug 1 1.56%
55 Feb 0 0.00%
Here is the current SQL
Select TO_CHAR (RCA_CLOSE_DATE, 'Month') "Month",
SUM (CASE WHEN RCA_CODE = 'BI&D' THEN 1 ELSE 0 END) "BI&D - CBAT No of Adj",
Count(1) as "Count of Adjustments"
from TW_BILL_ADJ_DATA
where (RCA_CLOSE_DATE between nvl (:P8_DATE_FROM,FORM_RECEIVED)
and nvl (:P8_DATE_TO, FORM_RECEIVED))
group by TO_CHAR (RCA_CLOSE_DATE, 'Month')

You can try something like this one:
Select TO_CHAR (RCA_CLOSE_DATE, 'Month') "Month",
SUM (CASE WHEN RCA_CODE = 'BI&D' THEN 1 ELSE 0 END) "BI&D - CBAT No of Adj",
Count(1) as "Count of Adjustments",
round(count(1)/SUM(CASE WHEN RCA_CODE = 'BI&D' THEN 1 ELSE 0 END) * 100,2) || '%' percent
from TW_BILL_ADJ_DATA
where (RCA_CLOSE_DATE between nvl (:P8_DATE_FROM,FORM_RECEIVED)
and nvl (:P8_DATE_TO, FORM_RECEIVED))
group by TO_CHAR (RCA_CLOSE_DATE, 'Month')
CODE NOT TESTED !!!
Best Regards
Krystian Zieja / mob

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FS2 Blocks (25-50) .....................               1
FS3 Blocks (50-75) .....................               0
FS4 Blocks (75-100).....................               1
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Total MBytes............................               7
Unused Blocks...........................              65
Unused Bytes............................         532,480
Last Used Ext FileId....................               4
Last Used Ext BlockId...................           1,289
Last Used Block.........................              63
PL/SQL procedure successfully completed.
SQL>http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5350053031470
I use this to find the space allocations.
Just read your post again,this is not going to show you the percentage of the free/used space. This is going to be the number of blocks which are free/used. For the growth trend, you can look at (in 10g) Oracle EM. It has added now,Segment Growth Trend report which can show you for each object,comparing to the allocated space to the object,how much space is being used by it.
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