Is it possible to get cumulative percentage of a running total on a count in Crystal Reports?

Here is what I have so far:
Report Query:
Group  SELECT "Type", "H_OOS"."Lot_Number"
 FROM   "OfflineED"."dbo"."H_OOS" "H_OOS"
 WHERE  ("H_OOS"."Lot_Number">='08297' AND "H_OOS"."Lot_Number"<='09027')
 ORDER BY "H_OOS"."Type", "H_OOS"."Lot_Number"

The Lot_Number is a string, but used as a date - 090207 = Feb 7, 2009
I have a bar graph on the report with count of type  and asked to add line graph with the cumulative percentage :
Example:
Appearance
09007
09016
09021
09022
09023
Total 5
 RTotalC 5

Fill
09019
Total 1
RTotalC 6

Color
08297
09008
09008
09012
Total 4
RTotalC  10

 Create cumulative %  and graph
50%
60%
100%