The official currency of Ceylon was the Ceylon Rupee. The national currency of Seychelles is the Seychellois rupee. Bhutan's currency is the ngultrum, whose value is fixed to the Indian rupee. It was the only state in India which had its own currency, the Hyderabadi rupee. Other currencies (including the Hyderabadi rupee and the Kutch kori) had different values. The price hike is on account of the weakening of Rupee. The national economy contracted in July 1991 as the Indian rupee was devalued. Both the Nepalese rupee and Bhutanese ngultrum are pegged with the Indian rupee. The monetary system was retained with one Rupee consisting of 16 Annas. Historically, the rupee was a silver coin. The Hyderabadi Rupee coins featured the Charminar. This led the government to devalue the rupee. He emphasised a free economy with a stable Rupee which India has adopted recently. Sri Lanka decimalised its rupee in 1869. He minted silver coins, called "Naderi", that were equal to the Mughal rupee.