DATA FEMWORK;
INPUT YEAR 1-4 FEMALES 6-10;
CARDS;
1948 28.0
1949 28.3
1950 28.8
1951 29.3
1952 29.4
1953 29.2
1954 29.4
1955 30.2
1956 31.0
1957 31.2
1958 31.5
1959 31.7
1960 32.3
1961 32.6
1962 32.7
1963 33.2
1964 33.6
1965 34.0
1966 34.6
1967 35.1
1968 35.5
;
DATA FEMWORK;SET;
LFEMALES=LAG(FEMALES);