Adding a line to a population bar chart
 

Hello,
I've created a population bar chart showing age-sex ratios, left hand side of chart is males, right hand side is females, labels (age groups are on the Y axis), values (%'s and absolute numbers) on the X axis. This is recently released data from the UK 2011 census. However I would like to add 2 lines for another range showing 2001 census data for the equivalent sex/age groups. Is this possible?