Last Updated: Sep 30, 2016 Views: 12
I haven't found any article which quantifies the growth of studio glass. I am wondering if you should contact the Glass Art Society (http://www.glassart.org/) to see if they have documented this in their records. There are certainly many articles about how the movement has grown, but I haven't seen any compiled statistics. Most of the statistics we have seen come from GAS.
You might look in some of the more current histories of the studio glass movement and see if any of the authors cited growth of the movement. I am including a couple of bibliographies which may help you in that.