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Bulgaria - National Rainfall Index (NRI)

543 (mm/yr) in 2002

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

Date Value Change, %
2002 543 0.43%
1997 541 1.73%
1992 532 -1.39%
1987 539 -19.99%
1982 674 5.97%
1977 636 -6.07%
1972 677 -1.30%
1967 686

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