Another day, another Harry Potter revelation on the internet.
Despite the series of children's books ending nine years ago, people are still finding things to talk about, such as the possibility of Draco Malfoy being a werewolf, or Albus Dumbledore being a time-travelling Ron Weasley.
The latest is the reason for Harry's rather depleted year in the context of Hogwarts overall.
J.K. Rowling has herself previously said that roughly 1,000 students attended Hogwarts in Harry's time.
However, there only seemed to be roughly five boys and girls in Harry's year in each house - making a total of roughly 40 in his year group.
So if there are seven years in Hogwarts, the maths are somewhat wrong, surely?
The theory that attempts to explain this attributes Voldemort as the reason.
As marauders4evr espouses, methodical killing of witches and wizards at the peak of his powers (1979-1981) would probably have led to less conceptions of magical children in Harry's year group (class of 1998) because there were less young couples about who also may have not wished to raise a child at that terrifying time - therefore there would have probably been a baby drought.
Alternatively, Rowling simply chose not to write about 130 characters in Harry's year.
Who knows until J.K. herself confirms or denies?