Finally, its share of total First-Class Mail dropped from 8.1 percent in 1990 to 6.4 percent in 1997.
The drop in First-Class Mail could be attributed to the increased used of email.
mnli hypothesis: The drop in First-Class Mail could be attributed to the increased used of email. premise: Finally, its share of total First-Class Mail dropped from 8.1 percent in 1990 to 6.4 percent in 1997.