Comparative dates on which the Nationals notched their 21st win, each season:
2012 - 12th May (33rd match of season)
2005 - 16th May (38th match)
2010 - 19th May (41st match)
2011 - 20th May (44th match)
2008 - 23td May (49th match)
2007 - 27th May (51st match)
2006 - 28th May (51st match)
2009 - 20th June (67th match)