| Similarity | Rank | |
|---|---|---|
| 2011 | 0.989 | 635 |
| 2009 | 0.984 | 927 |
| 2008 | 0.974 | 1035 |
| 2007 | 0.967 | 1267 |
| 2012 | 0.966 | 515 |
| 2006 | 0.950 | 1538 |
| 2005 | 0.940 | 1749 |
| 2004 | 0.923 | 2062 |
| 2003 | 0.900 | 2268 |
| 2002 | 0.888 | 2628 |
| 2013 | 0.887 | 461 |
| 2001 | 0.867 | 2615 |
| January | 0.856 | 1183 |
| February | 0.855 | 1490 |
| September | 0.855 | 1064 |
| November | 0.850 | 1119 |
| June | 0.849 | 977 |
| October | 0.848 | 1063 |
| March | 0.844 | 1020 |
| April | 0.843 | 1032 |
| 1999 | 0.841 | 3420 |
| December | 0.840 | 1164 |
| August | 0.836 | 1214 |
| July | 0.832 | 1038 |
| 1998 | 0.825 | 3724 |