That chart of "lowest three" ice extents - does it measure the lowest three so far up to the year in question or does it consider future years too? ie if 2012 set a record for a given day which 2016 subsequently beat, would the day be ranked as a "lowest" or a "second lowest" for 2012?
As David correctly stated above, the stacked bar chart updates as each new data point for 2017 comes in. However, that's only the case for the chart on my computer; the one shown in yesterday's comment is merely a static GIF representation.
Since the data for Day 104 (April 14th) has been added, the number of "lowest" places for 2017 has risen from 55 to 56. However, this introduces a "shuffle effect", with 2016 losing a "lowest" but gaining a "2nd", 2004 losing a "2nd" but gaining a "3rd", and 2007 losing a "3rd".
My intention is to re-post an updated version of the stacked bar chart each time something significant happens. I suspect the next such instance will be when 2017 overtakes 2007 in terms of total number of appearances in the lowest 3.