The 2015 SERF Index The 2015 SERF Index Update is now an outdated version of the SERF Index.  The data files are provided here for the convenience of researchers who may be currently using these older versions of the data.  The 2015 SERF Index Update provides SERF Index scores for 10 separate years; 2003 through … Continue reading 2015 International SERF Index Update Downloads