The graph below shows 18-year time series of Iranian GDP growth rate and the oil barrel price. The oil world crisis of 1986 sunk oil barrel prices, but an impressive recovery can be seen in the subsequent four years, followed by a two-year period of stabilization. In 1992, however, the oil prices fell again, managing to rise moderately until 1997 when dip before a new short period of stagnation.
Iranian economy is intrinsically dependent on the international oil trade and the graph depicts this close relationship. Deep falls and skyrocketing rises on the international oil barrel price are followed with similar trends in Iranian GDP growth rate. Even a quick dip in the oil prices as observed in years 2000/2001, is reflected in the Iranian GDP growth rate.
The graph below depicts the changes in the state tax revenue between 1999 and 2009. From 2000 to the first two quarters of 2002, state tax revenue decreased sharply when began a choppy uprising movement until the third quarter of 2005 when achieved the peak of the whole period. It is worth mentioning the rapid growth during the second half of 2002 and during the first semester of 2005. But starting in the 2005 peak, tax revenue decreased steadily up to first quarter of 2009, when it dropped abruptly again.
All these variations and especially the intense drops observed on the graphs make it easier to understand why states were under financial risks during this decade. Without consistent tax revenue it was hard to state officials to define public policies priorities and finance them appropriately.
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