Data calculated for State of the Tropics 2014 report from original souce: Bhatt S, Gething PW, Brady OJ, Messina JP, Farlow AW, Moyes CL, Drake JM, Brownstein JS, Hoen AG, Sankoh O et al. (2013). The global distribution and burden of dengue. Nature. April, 496: 504-507. Data are number of clinical cases reported by WHO regional offices, expressed as average yearly cases between 2008 and 2011.