mean citations per publication
This metric is the mean number of citations per publication. It has been described under many names, including the C/P index, the mean citation rate (MCR), the mean observed citation rate (MOCR), citations per publication (CPP), the observed citation rate (OCR), the generalized impact factor (If), and the journal paper citedness (JPC).
$$C/P\text{ index}=\frac{C^P}{P}$$History
| Year | C/P |
|---|---|
| 1997 | 0.3333 |
| 1998 | 2.0000 |
| 1999 | 4.8889 |
| 2000 | 6.0714 |
| 2001 | 8.2222 |
| 2002 | 11.7273 |
| 2003 | 15.3462 |
| 2004 | 22.0345 |
| 2005 | 26.9143 |
| 2006 | 37.5278 |
| 2007 | 45.8718 |
| 2008 | 54.9268 |
| 2009 | 61.0000 |
| 2010 | 65.7451 |
| 2011 | 73.7455 |
| 2012 | 84.7679 |
| 2013 | 88.9516 |
| 2014 | 97.3438 |
| 2015 | 103.7612 |
| 2016 | 111.2899 |
| 2017 | 119.0143 |
| 2018 | 119.9733 |
| 2019 | 127.2105 |
| 2020 | 134.4156 |
| 2021 | 140.2405 |
| 2022 | 140.3690 |
| 2023 | 147.8929 |
| 2024 | 150.1954 |
| 2025 | 150.7416 |