| 2000 | two thousand | two thousand |
| 2001 | two thousand and one | two thousand one (US) |
| 2002 | two thousand and two | two thousand two |
| 2003 | two thousand and three | two thousand three |
| 2004 | two thousand and four | two thousand four |
| 2005 | two thousand and five | two thousand five |
| 2006 | two thousand and six | two thousand six |
| 2007 | two thousand and seven | two thousand seven |
| 2008 | two thousand and eight | two thousand eight |
| 2009 | two thousand and nine | two thousand nine |
| 2010 | two thousand and ten | twenty ten |
| 2011 | two thousand and eleven | twenty eleven |
| 2012 | two thousand and twelve | twenty twelve |
| 2015 | two thousand and fifteen | twenty fifteen |
| 2020 | two thousand and twenty | twenty twenty |
| 2021 | two thousand and twenty-one | twenty twenty-one |
| 2024 | two thousand and twenty-four | twenty twenty-four |
| 2025 | two thousand and twenty-five | twenty twenty-five |