These are the Figures from the Vines et al Correspondence piece in Nature
Figure 1. The average number of review requests sent per review obtained +/- one standard deviation. The journal switched from an email based to an online manuscript management system in 2008.
Figure 2. (a) Relationship between submissions to Molecular Ecology from 2001 to 2007 and the number of unique reviewer names. Years are in order left to right. (b) Mean (points) and standard deviation (error bars) of the number of reviews per reviewer.