Countries at similar performance levels may have substantially different ranks, especially in the
middle and lower country income ranges. Particularly, ranking and relative changes in ranks from one
LPI edition to another need to be treated with caution. The latest LPI report also provides a country
listing with the weighted average of LPI scores and ranks across all four editions in 2007-2014. This
listing smooths out the inevitable variation from one year to another in survey-based data, and it thus
provides a more balanced overall picture.