I’ve updated the autosomal testing growth graph with current and historical numbers provided by the good folks at GEDmatch. Feel free to use the graph in presentations to genealogical societies, with acknowledgment.
GEDmatch, in case you’re not yet familiar, is a website that lets you compare your DNA test results across companies. If you tested at 23andMe and a cousin tested at Family Tree DNA, you can both transfer your raw data files to GEDmatch to see how much DNA you share. If your testing company does not have a chromosome browser (e.g., AncestryDNA and MyHeritage), you can use the one at GEDmatch to see as exactly where in your genomes you match your relatives. You can also find new DNA relatives there and use GEDmatch’s analysis tools, several of which are not available elsewhere. Best of all, the basic tools at GEDmatch are free! They take donations and offer some premium (called “Tier 1”) tools to their subscribers.