After a period of approximately 2,000 years of little change (not shown here), global average sea level rose throughout the 20th century, and the rate of change has accelerated in recent years. When averaged over all the world’s oceans, absolute sea level increased at an average rate of 0.06 inches per year from 1880 to 2012. Since 1993, however, average sea level has risen at a rate of 0.11 to 0.12 inches per year—roughly twice as fast as the long-term trend.
Relative sea level rose along much of the U.S. coastline between 1960 and 2013, some stations registered increases of more than 8 inches
http://www.epa.gov/climatechange/science/indicators/oceans/sea-level.html
http://ocean.nationalgeographic.com/ocean/critical-issues-sea-level-rise/
http://www.bbc.co.uk/climate/impact/sea_level.shtml
