In contrast, the boroughs of Xochimilco (172th), Tláhuac (177th) and Iztapalapa (183th) presented the lowest HDI values of the Federal District with values of .8481, .8473 and .8464 respectively—values still in the global high-HDI range. The only borough that did not present a high HDI was that of rural Milpa Alta which presented a "medium" HDI of .7984, far below all other boroughs (627th nationally while the rest stood in the top 200). Mexico City's HDI for the 2005 report was of .9012 (very high), and its 2010 value of .9225 (very high) or (by newer methodology) .8307, and Mexico's highest.

What borough had the lowest HDI score in the federal district?