How to show percentage difference in chart

I am preparing a line graph showing 2007 versus 2006. In my worksheet I have also calcuated the percentage difference. I'd like to show the percentage difference, but not graph it. Is there a way to show this percentage in the chart?

Thanks.
Data
2007 2006 %
JAN 1,189 1,193 0%
FEB 1,249 954 31%
MAR 1,135 1,278 -11%
APR 1,046 1,257 -17%
MAY 748 1,188 -37%
JUN 1,058 1,343 -21%
JUL 849 1,170 -27%
AUG 1,126
SEP 1,346
OCT 1,309
NOV 1,377
DEC 1,432