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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 |
|---|---|
| 1957 | 1 |
| 1988 | 1 |
| 1991 | 1 |
| 1996 | 1 |
| 1998 | 1 |
| 1999 | 1 |
| 2000 | 1 |
| 2001 | 1 |
| 2002 | 27 |
| 2003 | 49 |
| 2004 | 44 |
| 2005 | 49 |
| 2006 | 69 |
| 2007 | 81 |
| 2008 | 86 |
| 2009 | 114 |
| 2010 | 133 |
| 2011 | 166 |
| 2012 | 239 |
| 2013 | 312 |
| 2014 | 344 |
| 2015 | 351 |
| 2016 | 383 |
| 2017 | 407 |
| 2018 | 464 |
| 2019 | 539 |
| 2020 | 627 |
| 2021 | 676 |
| 2022 | 739 |
| 2023 | 715 |
| 2024 | 905 |
| 2025 | 258 |