A once-popular children's doll is slowly declining in popularity. The quartic function f(x) = - 0.025x* +0.561x - 3.617x2 - 1.219x + 86.923, where x is the number of years since 1993, can be used to estimate the number of dolls of this type that were sold (in thousands) during a given year from 1993 to 2003, Estimate how many dolls were sold in 1998. The number of dolls sold in 1998 was approximately (Round to the nearest thousand.)

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