No Market Share movement for Drupal 7 yet sorry.
Get a list of 1,034,823 websites using Drupal 7 which includes location information, hosting data, contact details, 332,465 currently live websites
and an additional 336,034 domains that redirect to sites in this list. 702,358 sites that used this technology previously and 130,533 websites in the United States currently using Drupal 7.
Distribution of locations of all Drupal 7 customers we've ever tracked.