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Table representation of search results timeline featuring number of search results per year.
| Year | Number of Results |
|---|---|
| 1972 | 1 |
| 1973 | 1 |
| 1981 | 1 |
| 1988 | 1 |
| 1989 | 1 |
| 1991 | 1 |
| 1994 | 1 |
| 1995 | 3 |
| 1998 | 3 |
| 1999 | 2 |
| 2000 | 6 |
| 2001 | 8 |
| 2003 | 4 |
| 2004 | 5 |
| 2005 | 1 |
| 2006 | 5 |
| 2007 | 4 |
| 2008 | 5 |
| 2009 | 5 |
| 2010 | 6 |
| 2011 | 8 |
| 2012 | 12 |
| 2013 | 15 |
| 2014 | 8 |
| 2015 | 4 |
| 2016 | 17 |
| 2017 | 16 |
| 2018 | 16 |
| 2019 | 15 |
| 2020 | 18 |
| 2021 | 25 |
| 2022 | 23 |
| 2023 | 21 |