Population in Western Pacific (WHO regions) 20 indicators covering population for Western Pacific (WHO regions). IndicatorLatest Year10-yr change Rank Total population by age 13,278 2100 down 9.6% 62nd Total population by age 18,998 2023 up 69.1% 9th Proportion of population using of on-site sanitation facilities with 2.65 2024 up 112.2% 16th Proportion of population using basic sanitation services 30.43 2024 down 13.4% 12th Proportion of population using safely managed sanitation services 64.75 2024 up 38.0% 11th Proportion of population using sanitation facilities connected to 46.05 2024 up 41.3% 13th Proportion of population using on-site sanitation facilities with 16.06 2024 up 22.6% 43rd Proportion of population using improved drinking water sources 96.55 2024 up 4.8% 26th Proportion of population using limited drinking water services 1.2 2024 up 11.4% 48th Proportion of population using sanitation facilities connected to 51.45 2024 up 16.1% 21st Proportion of population using unimproved sanitation facilites 1.4 2024 down 86.7% 54th Proportion of population using limited sanitation services 2.81 2024 down 34.9% 50th Proportion of population using at least basic sanitation services 95.18 2024 up 16.0% 10th Proportion of population using improved sanitation facilities 97.99 2024 up 13.4% 10th Proportion of population using improved latrines and other improved 14.45 2024 down 18.6% 46th Proportion of population using sanitation facilities connected to 32.07 2024 up 35.6% 9th Proportion of population practising open defecation 0.6118 2024 down 80.2% 50th New internal displacements 17.77 million 2025 up 155.9% 15th Internally displaced persons 1.67 million 2025 up 2,125.7% 113th International migrants, by country of destination 24.31 million 2024 up 23.1% 47th