The Sierran dollar (Sign: $, code: KSD) is the official currency of the Kingdom of Sierra and is divided into 100 subunits known as cents. Circulated and managed by the Royal Monetary Authority, Sierra's central banking system, the current currency has been in use continuously since 1863, replacing the California dollar, a remnant of Sierra's predecessor state, the California Republic. It is the world's fourth-largest reserve currency and is used unofficially by three other sovereign states: Colombia, Pakistan, and Zimbabwe. It is the de facto currency in the case for Zimbabwe which began using the Sierran dollar in 2003.