For each week beginning on a given date, the figures show the number of sites that reported they are using the matrix 6.x-1.3 release.

Matrix field project page
matrix 6.x-1.3 release page
All Matrix field usage statistics
Usage statistics for all projects

Week starting Count
March 20th, 2016 1
July 28th, 2013 2
July 14th, 2013 3
November 25th, 2012 1

Only Drupal websites using the Update Status module are included in the data. Read more information about how these statistics are calculated.