"NOAA made some significant and apparently linear changes to the pole location data going back to the years 2001 through 2010. The most noticeable result of the changes that they made was an overall linear slow down of the shift during the past decade, although still currently high at 30 miles per year. They have projected positional data through 2015 and have slowed the pace of movement each subsequent year from 30 miles (2012) to 24 miles (2015)."