Table A2-31 First-Class Mail -- Reason for Lateness (Percentage of Pieces that Arrived Late) Postal Fiscal Years 1987, 2006 and 2007 (Diary Data)
Reason for Lateness	Percent
	1987	2006	2007
Mailed Late	36.1	26.0	26.9
Not mailed late	22.1	27.8	21.8
Don't know when mailed	22.7	38.4	40.4
Don't know/No answer	19.0	7.8	10.9
Total	100.0	100.0	100.0
Note: Totals may not sum due to rounding.