TAI (and TT), to which pulsar data are referenced, would not exist without the cooperation of institutions in over 50 nations, who regularly report their data to BIPM.
Using a geodetic VLBI database of over a million observations, contributed by numerous groups since 1979, the apparent motion and structure of radio quasars and galaxies are being actively studied, along with its implications for cosmology and gravitational radiation. This pooling of geodetic VLBI data began in 1980 as a specific, but not immediately popular, requirement for participating in the MERIT campaign. Using this VLBI data, pooled data from satellite and lunar laser ranging, and GPS data compiled by the International GPS Service for Geodynamics, Earth rotation parameters (including sidereal time) are determined by the IERS and the National Earth Orientation Service.
Many people can probably recall times when they would have liked to reanalyze their own older data, which was published but no longer computer-readable. Others doubtless have data they never published, but can no longer read because their computer system changed. In a properly run archive system such data would never be lost. An interesting discussion on the value of unpublished data can be found in the essay "Cordelia's Dilemma," by S.J. Gould, included in the book Dinosaur in a Haystack.