DATA MILITARY;
INPUT YEAR 1-4 DEFENSE 6-9;
CARDS;
1948 .36
1949 .32
1950 .30
1951 .49
1952 .65
1953 .66
1954 .66
1955 .59
1956 .57
1957 .56
1958 .54
1959 .51
1960 .50
1961 .48
1962 .48
1963 .47
1964 .45
1965 .42
1966 .42
1967 .44
1968 .45
;
DATA MILITARY;SET;
LDEFENSE=LAG(DEFENSE);