Comparative dates on which the Nationals notched their 30th win, each season:
2017 - 27th May (48th match of season)
2016 - 29th May (51st match)
2018 - 28th May (52nd match)
2012 - 2nd June (51st match)
2005 - 4th June (56th match)
2015 - 5th June (55th match)
2014 - 5th June (58th match)
2013 - 9th June (61st match)
2019 - 9th June (65th match)
2010 - 10th June (61st match)
2006 - 11th June (64th match)
2011 - 12th June (66th match)
2007 - 17th June (69th match)
2008 - 20th June (75th match)
2009 - 26th July (98th match)