Zeroth Anniversary (Wedding Day), September 1998.
First Anniversary (in Germany), September 1999.
Second Anniversary, September 2000.
Third Anniversary, September 2001.
Fourth Anniversary, September 2002.
Fifth Anniversary, September 2003.
Sixth Anniversary, September 2004.
Seventh Anniversary, September 2005.
Eighth Anniversary, September 2006.
Ninth Anniversary, September 2007.
Tenth Anniversary, September 2008.
Eleventh Anniversary, September 2009.
Twelfth Anniversary, September 2010.
Thirteenth Anniversary, September 2011.
Fourteenth Anniversary, September 2012.
Fifteenth Anniversary, September 2013.
Sixteenth Anniversary, September 2014.
Seventeenth Anniversary, September 2015 (close enough...).
Eighteenth Anniversary, September 2016.
Nineteenth Anniversary, September 2017.
Twentieth Anniversary, September 2018.
Twenty-first Anniversary, September 2019.
Twenty-second Anniversary, September 2020.
Twenty-third Anniversary, September 2021.
Twenty-fourth Anniversary, September 2023.
Twenty-fifth Anniversary, September 2023.