Comparative dates on which the Nationals notched their 20th win, each season:
2010 - 13th May (35th match of season)
2005 - 15th May (37th match)
2011 - 16th May (41st match)
2008 - 19th May (46th match)
2007 - 25th May (49th match)
2006 - 26th May (49th match)
2009 - 19th June (66th match)
