It grew from 5.2 billion pieces in 1987 to 9.9 billion pieces in 1997.
the number of pieces in 1987 was greater than the number of pieces in 1997.
mnli hypothesis: the number of pieces in 1987 was greater than the number of pieces in 1997. premise: It grew from 5.2 billion pieces in 1987 to 9.9 billion pieces in 1997.