Table A.—Number of Detailed Components Used in Calculating Alternative Measures of Real GDP and GDP Prices, Selected Years

	Annual estimates					Quarterly estimates
	1959	1972	1977	1987	1991	1959	1972	1977	1987	1991
Gross domestic product	765	992	2,260	2,678	1,088	585	818	829	1,061	1,061
Personal consumption expenditures	197	197	200	203	203	197	197	200	203	203
Durable goods	32	32	34	34	34	32	32	34	34	34
Nondurable goods	63	63	63	63	63	63	63	63	63	63
Services	102	102	103	106	106	102	102	103	106	106
Gross private domestic investment	346	348	1,603	1,831	241	166	174	174	214	214
Fixed investment	219	221	455	683	105	68	70	70	96	96
Nonresidential	201	203	437	665	87	59	61	61	87	87
Structures	18	20	20	20	20	18	20	20	20	20
Producers' durable equipment	183	183	417	645	67	41	41	41	67	67
Residential	18	18	18	18	18	9	9	9	9	9
Change in business inventories	127	127	1,148	1,148	136	98	104	104	118	118
Net exports of goods and services	51	83	91	278	278	51	83	89	278	278
Exports	25	42	48	135	135	25	42	46	135	135
Merchandise	5	11	11	98	98	5	11	11	98	98
Services	20	31	37	37	37	20	31	35	37	37
Imports	26	41	43	143	143	26	41	43	143	143
Merchandise	5	13	13	113	113	5	13	13	113	113
Services	21	28	30	30	30	21	28	30	30	30
Government purchases	171	364	366	366	366	171	364	366	366	366
Federal	68	261	261	261	261	68	261	261	261	261
National defense		191	191	191	191		191	191	191	191
Nondefense		70	70	70	70		70	70	70	70
State and local	103	103	105	105	105	103	103	105	105	105

NOTE.—For more information on the system of components, including the decrease in the number of components after 1987, see Allan H. Young, "Alternative Measures of Change in Real Output and Prices," SURVEY 72 (April 1992): 41. In the 1993 annual NIPA revision, 1987-level annual detail will be available through 1991. The chain-type annual-weighted indexes will use the 1987 detail through 1991; the benchmark-years-weighted indexes based on weight years 1987 and 1992 will use the level shown for 1991 in the table.