The survey found an average annual decline of 1 percent to 2 percent a year.
For the last few weeks, the agency had been estimating that the total annual decline in the insurance fund would be about $2 billion.
In the previous decade, the annual decline averaged 2.9 percent.
It was the third consecutive annual decline, the first time that has happened in 60 years.
He calculated that it fell 5.3 percent in 1991, the largest annual decline since the 1960's.
For passenger cars, the comparable figure was an annual decline of 4.1 percent.
For 1998 as a whole, the economy contracted by 2.8 percent, the first annual decline in a quarter-century.
It would be the third big annual decline in a row.
Last year, corporate profits fell 4.6 percent, their third straight annual decline.
The annual decline in 1990 was the third in a row.