This chart has been doing the rounds lately. It seems to be based on a TUC (UK trade union) analysis of the 2016 OECD Employment Outlook publication (Figure 1.6). But that particular figure shows changes in real wages over four consecutive periods since 2007 and clearly summing these numbers would not give the statistic they claim.
The OECD itself has a perfectly good tool for analysing real wages (https://data.oecd.org/earnwage/average-wages.htm) and it seems to give similar trends but very different actual figures.
What is going on?