| 2001 | tone |
| 2002 | chlorine |
| 2003 | inevitable |
| 2004 | lightning |
| 2005 | multimedia |
| 2006 | reluctant |
| 2007 | rush |
| 2008 | bias |
| 2009 | capsule |
| 2010 | latitude |
| 2011 | seismic |
| 2012 | skeleton |
| 2013 | anxiety |
| 2014 | inflation |
| 2015 | optimistic |
| 2016 | reform |
| 2017 | session |
| 2018 | shed |
| 2019 | slope |
| 2020 | vitamin |
