No Market Share movement for Drupal Version 5.x yet sorry.
Get a list of 1,660 websites using Drupal Version 5.x which includes location information, hosting data, contact details, 579 currently live websites
which includes 138 domains that redirect to sites in the list. 1,219 sites that used this technology previously and 263 websites in the United States currently using Drupal Version 5.x.
Distribution of locations of all Drupal Version 5.x customers we've ever tracked.