the March 1979 CPS. Although birth, death, and migration data on persons of Spanish origin are not available nationally, nor can these data be, at present, precisely estimated, rough computations indicate an approximate rate of natural increase (excess of births over deaths) of about 1.8 percent per year or 16.2 percent for the period between 1970 and 1979. Furthermore, net immigration from abroad could also have contributed significant growth. For example, in the 9-year period ending June 30, 1979, an estimated 1,001,000 immigrants were admitted to the United States from all Spanish-speaking countries as permanent residents.

Thus, all told, population growth for the period from April 1970 to March 1979 may account for most of the difference between the 1970 census and the March 1979 figures; the balance in the difference can be accounted for by the other reasons noted above.

NOTE

In the past the Census Bureau has designated a head of household to serve as the central reference person for the collection
and tabulation of data for each member of the household (or family). However, the trend toward recognition of equal
status and roles for adult family members makes the term "head" less relevant in the analysis of household and family
data. As a result, the Bureau is currently developing new techniques for the enumeration and presentation of data which
will eliminate the concept "head." Although the data in this report are based on this concept, methodology for future
Census Bureau reports will reflect a gradual movement away from this traditional practice.

Table 1. Population of Spanish Origin, by Sex and Type of Spanish Origin, for the United States and the Five Southwestern States: March 1979

1 INCLUDES CUBAN, CENTRAL OR SOUTH AMERICAN, AND OTHER SPANISH ORIGIN.

Table 2. Total and Spanish-Origin Population, by Broad Age Groups, Sex, and Type of Spanish Origin: March 1979

Table 3. Total and Spanish-Origin Population, by Age, Sex, and Type of Spanish Origin: March 1979 (FOR THE UNITED STATES)

Table 4. Total and Spanish Origin Population, by Age, Sex, and Type of Spanish Origin, for the Five Southwestern States: March 1979

1 INCLUDES PUERTO RICAN, CUBAN, CENTRAL OR SOUTH AMERICAN, AND OTHER SPANISH ORIGIN. 2 INCLUDES PERSONS WHO DID NOT KNOW OR DID NOT REPORT ON ORIGIN.