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| Year | Number of employees |
|---|---|
| 1930 | 140 |
| 1931 | 150 |
| 1932 | 165 |
| 1933 | 139 |
| 1934 | 160 |
| 1935 | 159 |
| 1936 | 183 |
| 1937 | 695 |
| 1938 | 912 |
| 1939 | 1,048 |
| 1940 | 1,137 |
| 1941 | 1,367 |
| 1942 | 1,456 |
| 1943 | 1,352 |
| 1944 | 1,144 |
| 1945 | 1,090 |
| 1946 | 1,436 |
| 1947 | 1,505 |
| 1948 | 2,245 |
| 1949 | 2,937 |
| 1950 | 2,888 |
| 1951 | 3,012 |
| 1952 | 3,277 |
| 1953 | 3,888 |
| 1954 | 4,621 |
| 1955 | 5,412 |
| 1956 | 6,334 |
| 1957 | 7,215 |
| 1958 | 7,145 |
| 1959 | 8,484 |
| 1960 | 9,109 |
| 1961 | 10,175 |
| 1962 | 11,037 |
| 1963 | 11,511 |
| 1964 | 11,822 |
| 1965 | 12,194 |
| 1966 | 12,643 |
| 1967 | 11,730 |
| 1968 | 13,105 |
| 1969 | 13,350 |
| 1970 | 13,243 |
| 1971 | 14,002 |
| 1972 | 13,789 |
| 1973 | 12,931 |
| 1974 | 13,318 |
| 1975 | 13,897 |
| 1976 | 14,495 |
| 1977 | 14,658 |
| 1978 | 14,610 |
| 1979 | 14,439 |
| 1980 | 14,634 |
| 1981 | 14,984 |
| 1982 | 14,869 |
| 1983 | 15,449 |
| 1984 | 15,212 |
| 1985 | 14,799 |
| 1986 | 14,479 |
| 1987 | 15,243 |
| 1988 | 15,486 |
| 1989 | 15,206 |
| 1990 | 16,181 |
| 1991 | 16,947 |
| 1992 | 17,405 |
| Source: Division of Personnel Management, NIH. | |
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