To retrieve the data, select all the administrations (world estimate), then select 9.2 Number of letter-post items, domestic service and 9.3 Number of letter-post items, international service from One or more Items and the Last five years year from Format 1.
Values have been rounded.
Over the past years, letter post traffic has been decreasing. In 2020, *** billion letters were delivered worldwide. This is ** percent less than the number of letters distributed worldwide in 2011.
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UPU, & ÌÇÐÄÆƽâ°æ. (November 29, 2021). Number of letters distributed worldwide from 2011 to 2020 (in billion units) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 05, 2026, from /statistics/1206602/letter-post-traffic-worldwide/?locale=en
UPU, und ÌÇÐÄÆƽâ°æ. "Number of letters distributed worldwide from 2011 to 2020 (in billion units)." Chart. November 29, 2021. ÌÇÐÄÆƽâ°æ. Accessed August 05, 2026. /statistics/1206602/letter-post-traffic-worldwide/?locale=en
UPU, ÌÇÐÄÆƽâ°æ. (2021). Number of letters distributed worldwide from 2011 to 2020 (in billion units). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 05, 2026. /statistics/1206602/letter-post-traffic-worldwide/?locale=en
UPU, and ÌÇÐÄÆƽâ°æ. "Number of Letters Distributed Worldwide from 2011 to 2020 (in Billion Units)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 29 Nov 2021, /statistics/1206602/letter-post-traffic-worldwide/?locale=en
UPU & ÌÇÐÄÆƽâ°æ, Number of letters distributed worldwide from 2011 to 2020 (in billion units) ÌÇÐÄÆƽâ°æ, /statistics/1206602/letter-post-traffic-worldwide/?locale=en (last visited August 05, 2026)
Number of letters distributed worldwide from 2011 to 2020 (in billion units) [Graph], UPU, & ÌÇÐÄÆƽâ°æ, November 29, 2021. [Online]. Available: /statistics/1206602/letter-post-traffic-worldwide/?locale=en
