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The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
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The https:// ensures that you are connecting to the
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and transmitted securely.
Table representation of search results timeline featuring number of search results per year.
| Year | Number of Results |
|---|---|
| 1969 | 2 |
| 1971 | 1 |
| 1972 | 1 |
| 1974 | 2 |
| 1975 | 2 |
| 1976 | 2 |
| 1977 | 5 |
| 1978 | 4 |
| 1979 | 2 |
| 1980 | 1 |
| 1981 | 5 |
| 1982 | 2 |
| 1984 | 3 |
| 1985 | 4 |
| 1987 | 4 |
| 1988 | 5 |
| 1989 | 3 |
| 1990 | 1 |
| 1994 | 1 |
| 1996 | 1 |
| 1997 | 1 |
| 2000 | 1 |
| 2013 | 2 |
| 2015 | 1 |
| 2018 | 1 |
| 2021 | 2 |
| 2025 | 0 |