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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 |
|---|---|
| 1972 | 2 |
| 1973 | 4 |
| 1975 | 2 |
| 1978 | 1 |
| 1979 | 1 |
| 1985 | 1 |
| 1986 | 1 |
| 1989 | 4 |
| 1990 | 2 |
| 1991 | 1 |
| 1992 | 1 |
| 1997 | 2 |
| 2006 | 1 |
| 2007 | 1 |
| 2012 | 2 |
| 2013 | 8 |
| 2014 | 8 |
| 2015 | 7 |
| 2016 | 13 |
| 2017 | 12 |
| 2018 | 8 |
| 2019 | 10 |
| 2020 | 11 |
| 2021 | 10 |
| 2022 | 12 |
| 2023 | 8 |
| 2024 | 8 |