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2019 marked the 20th anniversary of the International VLBI Service forGeodesy and Astrometry (IVS). This service is the largest and mostauthoritative organization that coordinates international activities in radioastrometry and VLBI sub-system of space geodesy. Currently, about 60 antennaslocated in many countries on all continents participate in the IVS observingprograms. The IVS Data Centers have accumulated more than 18 millionobservations obtained during more than 17'000 sessions, including more than10,000 Intensive sessions for rapid determination of Universal Time. The papertraces the dynamics of IVS development based on statistical processing of thearray of observations collected in the IVS Data Centers for the period of1979-2018. Various statistics by the years, stations, baselines, and radiosources are provided. The evolution of the IVS observational data and theaccuracy of results obtained from processing VLBI observations is considered.

Statistical analysis of the results of 20 years of activity of the International VLBI Service for Geodesy and Astrometry