The graph shows the average number of authors and the average number of programs per paper over time. Instrument-level information for observations by VLT/VLTI and Chajnantor facilities is available since the start of operations of the respective telescopes and instruments. For La Silla facilities, this information is only available starting in publication year 2000.
Current year only shown as of July. Statistics for a given year will not be complete until approx. March of the following year.