Piechart not taking the exact values of table

Hi,

I am using the pie chart in WAD

EX:- I have the data like this

Material Revenue%

1 65%

2 12%

3 10%

4 7%

5 2%

_____

100%

when we add these values 65121072= 96%

Now when I see my pie chart , its not picking the values from table instead its rounding up the values to make the overall total in the piechart to 100

Material Revenue%

1 68%

2 12%

3 10%

4 8%

5 2%

_____

100%

but I want to pick my table values ,how can this be done

Thanks

Priya