S U M H L Y L D W O R K γ t = ∑ M H L Y L D W O R K γ , m t {\displaystyle SUMHLYLDWORK_{\gamma }^{t}=\sum ^{M}HLYLDWORK_{\gamma ,m}^{t}}
W O R L D D I S A B I L I T Y t = ∑ R S U M H L Y L D W O R K γ t {\displaystyle WORLDDISABILITY^{t}=\sum ^{R}SUMHLYLDWORK_{\gamma }^{t}}
W O R L D W O R K P O P t = ∑ R P O P 15 T O 65 γ t {\displaystyle WORLDWORKPOP^{t}=\sum ^{R}POP15TO65_{\gamma }^{t}}
