Table A2-22 First-Class Mail -- Nonpresort Envelopes by Sector (Percentage of Total Envelopes) Postal Fiscal Years 1987, 2007 and 2008 (Diary Data)					YEAR	_TYPE_	_FREQ_	A224ROW1	A224ROW3	A224ROW4	A224ROW2	A224ROW5	I
					2007	0	62109	12.20322	31.2641	2.05884			6
					2008	0	57541	14.97123	33.7949	2.33867			6
					2007	0	17729				33.9714	2.25566	6
					2008	0	16525				36.595	3.46612	6
Sector	1987	2007	2008
Household-to-household	12.5	12.2	15.0
Household-to-nonhousehold	17.3	34.0	36.6
Nonhousehold-to-household	25.2	31.3	33.8
Unidentified incoming	0.5	2.1	2.3
Unidentified outgoing	2.5	2.3	3.5
Subtotal	58.0	81.8	91.2
Nonhousehold-to-nonhousehold	42.0	18.2	8.8
Total	100.0	100.0	100.0
Base: RPW Total, First-Class Envelopes.
Note: Totals may not sum due to rounding.