JAXA Analysis:
On April 30th, the year 2016 is the lowest on record, with 12,293,447 km2. 2018 will have to drop a daily average of 54.1K km2, to continue been the lowest on record on April 30th.
2006 is the second lowest on record on April 30th, with 12,661,451 km2. That is, 368K km2 above 2016. So, 2018 will be second lowest on record, if the daily average drop is less than 54.1 km2 but greater than 20.6K km2.
It is possible that 2018 drops more than 54.1K km2 average on the next 11 days, so I do not discard that could continue been the lowest on record. But I see a big probability that the average drop will be more than 20.6K km2. So, I think that -at least- 2018 will be second lowest on record at the end of April.
While the average drop of 2016 was 57.7K km2 on April 19-30, the average drop of 2012 was 75.4K km2. So, 2012 is already falling faster than 2006 and 2015-17.