Changes

== Trends ==

The first people to start advocating for cryonics emerged in 1962, and the first preservation happened 4 years later. From 1966 until 1973, of the 17 attempts at freezing, only one person remained cryopreserved<ref name="SuspensionFailures"/> (hence the bumps at the beginning of the curve in the graph below). Consequently, the "pay-as-you-go" funding model was abandoned by the cryonics community as relatives had shown to generally eventually lose interest in paying maintenance fees. From then onward, the number of cryopreservations would grow exponentially, but to this day still represent a trivial amount in comparison to the number of burials and cremations. Since cryonics was first publicized, an estimated 2.9 billion people have died,<ref>{{Cite journal|last=Ortiz-Ospina|first=Esteban|last2=Roser|first2=Max|date=2019-01-23|title=World Population Growth|url=https://ourworldindata.org/world-population-growth|journal=Our World in Data}}</ref> which could represent about 2.7% of humans to have ever lived.<ref>{{Cite web|url=https://www.prb.org/howmanypeoplehaveeverlivedonearth/|title=How Many People Have Ever Lived on Earth? – Population Reference Bureau|language=en-US|access-date=2019-01-23}}</ref> As of January 2019, 416 people are known to be cryopreserved.

[[File:Number_of_people_preserved_over_time.png]]

Memberships statistics can be tricky to track for a couple of reasons:

* Lack of present data: some organisations don't publicize their membership statistics

[[File:Number_of_Alcor_members.png]]

While ways to quantify the quality of preservations have been proposed, notably by [http://www.oregoncryo.com/qualityScores.html OregonCryo], there are currently no systematic analyses done about the quality of current preservations. The following graph is an attempt to track progress of cryopreservation techniques by tracking the biggest mass that was successfully cryopreserved.<ref>{{Citation|last=RomanPlusPlus|title=SPTCR: curated repository of scientific papers on cryonics: RomanPlusPlus/scientific-progress-towards-cryonics|date=2019-01-11|url=https://github.com/RomanPlusPlus/scientific-progress-towards-cryonics|access-date=2019-01-23}}</ref> It doesn't directly track what cryonicists care about, but can be used as a proxy while better metrics are developed.