Since they didn't spell out the number: 14% discrepency between CPI and ALICE baselined between 2007 and now. This and the year before have a dashed line for ALICE and only this year for CPI, I guess that means projected but it isn't labeled.
I'm not sure the baselining makes sense other than showing the divergence from 2007; if ALICE turned out to be lower than CPI lower it would bias it but maybe more likely it started higher which biases it in another way. Baselining at the first year of the great recession might be very misleading, baselining the year before and difference in housing stuff might have made the divergence look very different. Rents ended up increasing through the recession though even if prices didn't.
I'm not sure the baselining makes sense other than showing the divergence from 2007; if ALICE turned out to be lower than CPI lower it would bias it but maybe more likely it started higher which biases it in another way. Baselining at the first year of the great recession might be very misleading, baselining the year before and difference in housing stuff might have made the divergence look very different. Rents ended up increasing through the recession though even if prices didn't.