How often are movies released from the Disney Vault?

I know Disney has a select time where they release certain movies from "The Vault". And once they go back in its damn near impossible to find them again. I want to know how often are the movies released? And when will The Lion King, The Little Mermaid, Peter Pan and Bambi be released?How often are movies released from the Disney Vault?
Bambi was JUST released, The Lion King is coming soon, if it's not out already. You might still be able to find a copy of Peter Pan (I bought one about a year ago.) But for The Little Mermaid I'd try Amazon or eBay.How often are movies released from the Disney Vault?
i don't know if there is a set time span for them, but i know the lion king was last released around 2003, so that's about 8 years. The whole point of the vault is to keep the movies special and re-introduce them to the new generations. The more popular movies most likely get released more often than their less popular counterparts, but with still enough time in between to let new kids discover them. there's always places like ebay to buy the ones that aren't released