premiere editions get cheaper the newer they are. why?

[anon125]

on amazon canada...

Adobe Premiere Elements 2020 [PC/Mac Disc]

[PC/Mac Disc]

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List Price:	CDN$ 134.99
Price:	CDN$ 109.94

Adobe Premiere Elements 2019

Platform : Mac OS Sierra 10.12, Windows 8.1, Mac OS X El Capitan 10.11, Windows 10, Mac OS X, Windows 7

Price:

CDN$ 133.04

Adobe Photoshop Elements 2018 & Premiere Elements 2018

by Adobe

Platform : Windows, Macintosh

Price:

CDN$ 199.99

The invalid HTML has been removed. i never put any in!