No Market Share movement for Drupal Version 6.1x yet sorry.
Get a list of 11,551 websites using Drupal Version 6.1x which includes location information, hosting data, contact details, 4,349 currently live websites
which includes 1,328 domains that redirect to sites in the list. 8,530 sites that used this technology previously and 1,528 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.