My Jason1 + Jason2 + Jason3 concattenated graphical plot
http://diverse.4mg.com/jason1+2+3r.jpg
2003 to Nov 2017
retaining as much as possible of the 3 separate images, 2mm
discontinuities, linear "fit" segments etc.

Other such long-term plots

http://www.kpress.info/images/Jan_20...level_rise.jpg

https://www.aviso.altimetry.fr/filea... rence_sm.png

Anyone doubt a curve is a better fit than linear, then just a matter of
what sort of curve is the optimal fit.