No Market Share movement for Drupal Version 6.1x yet sorry.
Get a list of 12,755 websites using Drupal Version 6.1x which includes location information, hosting data, contact details, 3,867 currently live websites
and an additional 1,483 domains that redirect to sites in this list. 8,888 sites that used this technology previously and 1,718 websites in the United States currently using Drupal Version 6.1x.
Distribution of locations of all Drupal Version 6.1x customers we've ever tracked.