Two periods with no statistical significant warming trends are 1977 to 1985 and 1981 to 1989. (skepticalscience.com)
Independent analysis seem to indicate that over last half dozen years, the ocean has shown less warming than the long term trend but nevertheless, a statistically significant warming trend. (skepticalscience.com)
They find that, with an enlarged data set that has corrections for bias between drifting buoy data and data taken from ship intakes, as well as extended corrections for water cooling in buckets in the time between being drawn from the sea and being measured, there is a statistically significant warming trend of 0.086 °C per decade over the 1998 - 2012 period. (pacificclimate.org)