Table A2-25 First-Class Mail -- Total Cards by Sector (Percentage of Total Cards) Postal Fiscal Years 1987, 2006 and 2007 (Diary Data)
Sector	1987	2006	2007
Household-to-household	9.2	2.1	2.6
Household-to-nonhousehold	8.5	3.7	3.5
Nonhousehold-to-household	56.8	54.0	59.2
Unidentified incoming	0.6	1.1	1.0
Unidentified outgoing	0.0	0.5	0.6
Subtotal	75.1	61.4	66.9
Nonhousehold-to-nonhousehold	24.9	38.6	33.1
Total	100.0	100.0	100.0
Base: RPW Total, First-Class Cards.
Note: Totals may not sum due to rounding.