The Year–To–Date average extent is still 4th lowest for sea ice in the Arctic. So, all 4 lowest years are also the 4 latest years: 2016, 2017, 2018 & 2019. Next target is 2017.

Q: Where’s the data source for this plot?
A: Here:
Q: How can anyone make a year-to-date average graph?
A: Easy. Use a computer. Add all the ice for every day so far this year, divide by the number of days.
Q: Why would I even do that?
A: Let’s say you want to know how much ice we have in 2019 compared to other years.