I can't recall exactly how long I have known about and used Aw but perhaps 6 or 7 years.
In that time, going on observation and nothing scientific, I have seen the general half hour charge go up from 50 to 60 and now 70 seems almost a norm.
To find a 50 seems a surprise and you wonder if it's a typo, offer or something.
I also think the EE profiles are not much less if at all.
Certainly the one I have seen three times is at 70.
As I say, just observation and memory but prices seem to be increasing as far as I can see but I haven't looked at it over decades where inflation and everything muddies the water.