Government efforts to lower subsidies to unprofitable enterprises and to shrink the money supply caused the semi-official exchange rate for the Cuban peso to move from a peak of 120 to the dollar in the summer of 1994 to 21 to the dollar by year-end 1999. The drop in GDP apparently halted in 1994, when Cuba reported 0.7% growth, followed by increases of 2.5% in 1995 and 7.8% in 1996. Growth slowed again in 1997 and 1998 to 2.5% and 1.2% respectively. One of the key reasons given was the failure to notice that sugar production had become uneconomic. Reflecting on the Special period Cuban president Fidel Castro later admitted that many mistakes had been made, "The country had many economists and it is not my intention to criticize them, but I would like to ask why we hadn’t discovered earlier that maintaining our levels of sugar production would be impossible. The Soviet Union had collapsed, oil was costing $40 a barrel, sugar prices were at basement levels, so why did we not rationalize the industry?" Living conditions in 1999 remained well below the 1989 level.
Question: How many years was the time span where the Cuban peso exchange rate went from 120 to the dollar to 21 to the dollar?
Answer: 5