"A recent study appearing in the Geophysical Research Letters in April 2017 corrected the satellite measured sea level rise downwards from 3.3 mm annually to just 3.0 mm over the past 24 years – or less than half what PIK models projected.
Only 1.5 mm/year - Worse, satellite data measuring sea level have turned out to be far more complex and uncertain than one would wish. And so when measuring sea level rise along coastlines using tide gauges, sea level rise has even been far slower. Renowned Swedish sea level expert Axel Mörner published a paper in 2017 showing an observed sea level rise rate of only 1.5 – 2.0 mm/year.
Second half of the 20th century slower than in the first half - In a newly published paper by Frederiske et al. 2018 just this year, oceanographers estimate that global sea levels rose at a rate of only 1.42 mm per year between 1958 and 2014.