  Experimental results of E2 transition probabilities or B(E2) values for the
known first 2$^{+}$ states in 447 even-even nuclei have been compiled and
evaluated. The evaluation policies for the analysis of experimental data have
been described and new results are discussed. The recommended B(E2) values have
been compared with comprehensive shell model calculations for a selected set of
nuclei, where such theoretical procedures are amenable. The present work was
motivated by a rapid increase in the number of new B(E2) measurements for the
first 2$^{+}$ states since the previous evaluation of such data by S. Raman
{\it et al.} published in 2001. Future plans to investigate the systematics of
B(E2)$\uparrow$ values, and intercomparison of different experimental
techniques to obtain these data are outlined.
