A month ago it was 17%, then 20%, now 30%. In 5 months it will be 113%.
Not sure what you are referring to? Was it this?
On Tuesday the exchange rate for dollar was 15,300 rials at the free market, from around 13,400 rials to the dollar last week. The rial has lost over 50 percent value against the dollar in the past few months.
International sanctions imposed on Iran since 2006, particularly those which made it difficult to transfer cash in and out of Iran, have had a negative impact on the value of the currency and made it difficult for Iranian banks to do business with western banks.
Oil earnings still account for up to 60 percent of state income and a surge in consumer imports under Ahmadinejad and fuel and food subsidy cuts since 2010 have hit local industries and forced some plants to close.
A member of Tehran's Chamber of Commerce said the rial will further lose value in the coming days.
"Iran's foreign exchange system is suffering from weak management (failing) to curb the exchange rate," said Asadollah Asgaroladi, the Jomhuri-ye Eslami daily reported.
Revelation of a $2.6 billion embezzlement case in October also caused distrust among ordinary Iranians.
Some hardline politicians linked the main suspect in the fraud to a so-called "deviant current", allegedly led by Ahmadinejad's chief of staff and closest ally Esfandiar Rahim Mashaie.
He is accused by many Shi'ite clerics and politicians of trying to undermine the central role of the clergy in politics by emphasising the nationalist strain of Iranian history and culture.
Some MPs said the government was linked to the scam in order to fund monthly compensation of $40 per person introduced since eliminating fuel and energy subsidies.
"People do not trust the Central Bank's monetary policies," said economist Abolqasem Hakimipour, the semi official Fars news agency reported.
"The continued increase of the foreign exchange rate will lead to inflation rate to be over 27 percent and preventing this requires the Central Bank's swift action." (Reporting By Mitra Amiri)