The chart below displays the number of scenes visible to all users on EarthExplorer as of September 30, 2015.
In addition to the current Landsat 8 and Landsat 7 missions that are constantly increasing the data in the USGS archive, the Landsat Global Archive Consolidation (LGAC) effort is returning unique Landsat 1-5 MSS and TM data originally downlinked to International Ground Stations into the USGS archive, making even more data available to all users.
The files on the USGS Landsat Global Archive webpage (http://landsat.usgs.gov/USGSLandsatGlobalArchive.php) provide a view of the data added to the USGS archive per satellite, per year.
This scene is just one of over 823,415 scenes that were downloaded during the month of September 2015.
Landsat 8 Path 150 Row 36
Acquired June 10, 2013
This image of northern Pakistan shows the Tarbela Dam along the Indus River.
The Landsat archive became available to all users at no charge in December of 2008. As of September 28, 2015, over 29 million scenes have been downloaded by users worldwide.
This graph shows the top ten Landsat data uses from October 1, 2014 through September 30, 2015.