6.4 to 5.9 in 2000 but remains relatively high compared to the 1960s through the mid 1990s.
The number is now lower than it has ever been.
mnli hypothesis: The number is now lower than it has ever been. premise: 6.4 to 5.9 in 2000 but remains relatively high compared to the 1960s through the mid 1990s.