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Your dates are sorted incorrectly. W2010 happens before S2010, etc.

Thanks — just added the season sorted output to dsugarman's sibling comment.

You could merge the two charts, to make it shorter )

Winter x should be before summer x, should be a smoother curve

Thank you — here's the output sorted by Winters before Summers.

    S2005 1
    S2006 2
    W2007 2
    S2007 1
    W2008 2
    S2008 1
    W2009 1
    S2009 3
    W2010 1
    S2010 4
    W2011 4
    S2011 10
    W2012 10
    S2012 9
    W2013 7
    S2013 6
    W2014 5
    S2014 7
    W2015 6
    S2015 4
    W2016 6
    S2016 5
    W2017 2
    W2018 1

    S2005 *
    S2006 **
    W2007 **
    S2007 *
    W2008 **
    S2008 *
    W2009 *
    S2009 ***
    W2010 *
    S2010 ****
    W2011 ****
    S2011 **********
    W2012 **********
    S2012 *********
    W2013 *******
    S2013 ******
    W2014 *****
    S2014 *******
    W2015 ******
    S2015 ****
    W2016 ******
    S2016 *****
    W2017 **
    W2018 *

You missed the top 2.

thanks - fixed now