The main plot displays the observational history of the sources at less than 30° from the Sun (black: observations treated in LL09; red: additional observations of routine experiments not processed in LL09 excluding VLBA+ and VLBA; blue: VLBA+; green: VLBA). The upper plot gives the Sun spot number (SSN, Clette et al. 2007). The right plot displays the deflection angle predicted by General Relativity.