Read the link.Development.
How long have they actually been in production and approved use?
WTF?You don't count the development period when talking about a finished product.
The same as others.
History of polio vaccination
World Health Organization (WHO)
https://www.who.int › ... › History of Vaccination
The first successful vaccine was created by US physician Jonas Salk. Salk tested his experimental killed-virus vaccine on himself and his family in 1953.
A breakthrough occurred in 1949, when poliovirus was successfully cultivated in human tissue by John Enders, Thomas Weller and Frederick Robbins at Boston Children’s Hospital. Their pioneering work was recognized with the 1954 Nobel Prize.
Not long afterwards, in the early 1950s, the first successful vaccine was created by US physician Jonas Salk. Salk tested his experimental killed-virus vaccine on himself and his family in 1953, and a year later on 1.6 million children in Canada, Finland and the USA.
The results were announced on 12 April 1955, and Salk’s inactivated polio vaccine (IPV) was licensed on the same day. By 1957, annual cases dropped from 58 000 to 5600, and by 1961, only 161 cases remained.