Buy a high-quality Art Print of this poster (USA only)
EXTRA: A short photo story about how a version of this image ended up as the 91st and final cover design of our book, Information is Beautiful. Yes, 91 versions!
» Purchase: Amazon US or Barnes & Noble | UK or Waterstones
» Download: Apple iBook | Kindle (UK & US)
» See inside
For more graphics, visualisations and data-journalism:
» follow us on Email | Twitter | Facebook