N S G A P R = ( ∑ D G D P R ∑ D P O P r ) ( ∑ G D P r ∑ L P O P r ) {\displaystyle NSGAPR={\frac {({\frac {\sum ^{D}GDP_{R}}{\sum ^{D}POP_{r}}})}{({\frac {\sum ^{G}DP_{r}}{\sum ^{L}POP_{r}}})}}}
