The New Zealand Department of Internal Affairs have lead us to believe that 77% of world nations issue 5-year passports, however we've found that most nations issue adult passports for more than 5 years.
Furthermore, despite what the DIA are saying, that they believe more and more nations are adopting 5-year passports, we've actually found that the opposite has occurred, in fact many nations adopting biometric passport technology for the first time are moving from 5-year to 10-year passports, with Canada, China, Iceland, Saudi Arabia, Brazil and the Netherlands being notable recent examples.
Below is a full list of passport validity by issuing country.
YELLOW = 5 - 9 YEARS
Sao Tome and Principe
See Wikipedia for a larger map and article on passport validity.
GREY = NO DATA