Table A2-19 First-Class Mail -- Total Envelopes by Sector (Percentage of Pieces) Postal Fiscal Years 1987, 2008 and 2009 (Diary Data)					YEAR	_TYPE_	_FREQ_	A221ROW1	A221ROW3	A221ROW4	A221ROW2	A221ROW5	I
					2008	0	57541	6.250848863	47.6607	3.17725			6
					2009	0	52708	6.378529348	50.3505	3.13413			6
					2008	0	16525				16.4074	1.55405	6
					2009	0	15091				16.1843	0.82462	6
Sector	1987	2008	2009
Household-to-household	9.4	6.3	6.4
Household-to-nonhousehold	12.3	16.4	16.2
Nonhousehold-to-household	39.2	47.7	50.4
Unidentified incoming	0.6	3.2	3.1
Unidentified outgoing	1.4	1.6	0.8
Subtotal	62.9	75.1	76.9
Nonhousehold-to-nonhousehold	37.1	24.9	23.1
Total	100.0	100.0	100.0
Note: Totals may not sum due to rounding.
Base: RPW Total, First-Class Envelopes.