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National rainfall index

(mm per year)

Papua New Guinea is the top country by national rainfall index in the world. As of 2000, national rainfall index in Papua New Guinea was 3,250 mm per year that accounts for 8.53 % of the world's national rainfall index. The top 5 countries (others are Colombia, Equatorial Guinea, Myanmar, and Bangladesh) account for 34.62 % of it. The world's total national rainfall index was estimated at 38,118 mm per year in 2000.

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An indicator, developed by FAO, which represents the quality of the crop growing season. The NRI yearly results take into consideration the precipitation that year, the average precipitation over the period 1986-2000, the seasonality of the main crop-growing season (distinguishing between northern and southern hemispheres), and what areas of the country are wetter. The median of each five year period is provided. Note: due to methodological differences, this variable is not comparable to average precipitation