Comparative dates on which the Nationals notched their 10th win, each season:
2012 - 18th April (13th match of season)
2014 - 18th April (17th match)
2016 - 19th April (13th match)
2017 - 20th April (15th match)
2013 - 20th April (17th match)
2005 - 24th April (19th match)
2011 - 24th April (20th match)
2010 - 25th April (19th match)
2008 - 29th April (27th match)
2015 - 30th April (23rd match)
2006 - 5th May (30th match)
2009 - 8th May (28th match)
2007 - 11th May (35th match)
...good grief, the art of the GDT seems to be in decline - only 6 pages? (I'd contribute if only I had internet access at home.)