Institution IUCN & BirdLife International Reference "Relative annual contribution to the global Red List Index for mammals, birds, and amphibians in each GEO region and subregion" Date 2015 Base data "IUCN. IUCN Red List of Threatened Species. Version 2015-2. IUCN, Gland, Switzerland. Accessed 1 September 2015 from http://www.iucnredlist.org (2015)." Regionalisation Column A GEO regions Column B GEO subregions Values reported Columns C-E "Values are a measure of the relative annual contribution of each region/subregion to the overall change in the global Red List Index for the taxon considered during the corresponding assessment period (see Temporal Scale). Units are: number of changes in Red List status per year. For any given region/subregion, values are a weighted species richness divided by the number of years in the period considered, where each species is weighted by: i) the number of genuine category changes in The IUCN Red List of Threatened Species during the assessment period (one category change of increasing extinction risk = -1; one category change of decreasing extinction risk = +1), and ii) by the fraction of the species’ range occurring within the region/subregion. Category changes encompass the following categories, in order of increasing extinction risk: Least Concern; Near Threatened; Vulnerable; Endangered; Critically Endangered; Extinct in the Wild and Extinct (including Critically Endangered (Possibly Extinct) and Critically Endangered (Possibly Extinct in the Wild)). " Column F Sum columns C-E. Temporal scale Column C 1996-2008 Column D 1988-2008 Column E 1980-2004 Column F 1980-2008