When did the 'Wicked' series come out?

The original novel "Wicked:The Life and Times of the Wicked Witch of the West" by Gregory Maguire was released in 1995.

The musical Wicked isn't published (but you can find almost accurate librettos on the internet, or you can buy The Grimmerie online or at the musical, which contains a partial script), but it premiered at San Francisco's Curran Theatre in May 2003. In October, 2003, it moved to Broadway's Gershwin Theatre.