No Market Share movement for Drupal Version 5.x yet sorry.
Get a list of 1,833 websites using Drupal Version 5.x which includes location information, hosting data, contact details, 585 currently live websites
and an additional 176 domains that redirect to sites in this list. 1,248 sites that used this technology previously and 305 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.