For data, see Figures 3a and 3b of http://nsidc.org/arcticseaicenews/2019/10/ http://nsidc.org/arcticseaicenews/2019/10/ The long term trend is decrease of 12.

For data, see Figures 3a and 3b of http://nsidc.org/arcticseaicenews/2019/10/ http://nsidc.org/arcticseaicenews/2019/10/ The long term trend is decrease of 12.9% per decade. The steepest decline over 13 years is 1999 to 2012. There has been little decline over the 13 years 2007 to 2019.