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The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
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The site is secure.
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 |
|---|---|
| 1975 | 3 |
| 1977 | 3 |
| 1978 | 6 |
| 1981 | 1 |
| 1983 | 1 |
| 1984 | 1 |
| 1986 | 1 |
| 1987 | 1 |
| 1988 | 1 |
| 1989 | 1 |
| 1995 | 2 |
| 1996 | 1 |
| 2007 | 1 |
| 2008 | 1 |
| 2013 | 1 |
| 2014 | 1 |
| 2015 | 2 |
| 2017 | 2 |
| 2018 | 6 |
| 2019 | 8 |
| 2020 | 18 |
| 2021 | 9 |
| 2022 | 6 |
| 2023 | 11 |
| 2024 | 23 |