DATA MFEMWORK;
INPUT YEAR 1-4 MARRIED 6-10;
CARDS;
1948 23.1
1949 23.6
1950 24.8
1951 26.7
1952 26.8
1953 27.7
1954 28.1
1955 29.4
1956 30.2
1957 30.8
1958 31.4
1959 32.3
1960 31.7
1961 34.0
1962 33.7
1963 34.6
1964 35.6
1965 35.7
1966 36.5
1967 37.8
1968 39.1
;
DATA MFEMWORK;SET;
LMARRIED=LAG(MARRIED);