The East African shilling was the sterling unit of account in British-controlled areas of East Africa from 1921 until 1969. It was issued by the East African Currency Board. It is also the proposed name for a common currency that the East African Community plans to introduce. The shilling was divided into 100 cents, and twenty shillings were 1 pound. Unlike elsewhere in the possessions of the British Empire that used the sterling, in British East Africa the shilling instead of the pound was the primary unit of account, with the pound being a superunit mainly used for recording very large sums of money that would be inconvenient if quoted solely in shillings. This anomalous state of affairs arose because the first currency used by the British colonial authorities in British East Africa was the rupee, not sterling. The East African shilling was introduced to Kenya, Tanganyika, and Uganda in 1921, replacing the short-lived East African florin at a rate of 2 shillings to 1 florin. The florin had been introduced because of increasing silver prices after World War I. At that time, the Indian rupee was the currency of the British East African states. The rupee, being a silver coin, rose in value against sterling. When it reached the value of two shillings, the authorities decided to replace it with the florin. From the florin thence came the East African shilling. The currency remained pegged to one shilling sterling and was subdivided into 100 cents. In 1936, Zanzibar joined the currency board, and the Zanzibari rupee was replaced at a rate of to 1 Zanzibari rupee. It was replaced by local currencies (Kenyan shilling, Ugandan shilling, and Tanzanian shilling) following the territories' independence. In 1951, the East African shilling replaced the Indian rupee in the Aden colony and protectorate, which became the South Arabian Federation in 1963. In 1965, the East African Currency Board was breaking up, and the South Arabian dinar replaced the shilling in the South Arabian Federation at a rate of to 1 dinar.