Table A2-22 First-Class Mail -- Nonpresort Envelopes by Sector (Percentage of Total Envelopes) Postal Fiscal Years 1987, 2008 and 2009 (Diary Data)					YEAR	_TYPE_	_FREQ_	A224ROW1	A224ROW3	A224ROW4	A224ROW2	A224ROW5	I
					2008	0	57541	16.4034	37.0277	2.56238			6
					2009	0	52708	9.093309	33.2161	1.85645			6
					2008	0	16525				40.0957	3.7977	6
					2009	0	15091				40.3429	2.05555	6
Sector	1987	2008	2009
Household-to-household	12.5	16.4	9.1
Household-to-nonhousehold	17.3	40.1	40.3
Nonhousehold-to-household	25.2	37.0	33.2
Unidentified incoming	0.5	2.6	1.9
Unidentified outgoing	2.5	3.8	2.1
Subtotal	58.0	99.9	86.6
Nonhousehold-to-nonhousehold	42.0	0.1	13.4
Total	100.0	100.0	100.0
Base: RPW Total, First-Class Envelopes.
Note: Totals may not sum due to rounding.