Regen leaf cars

Hi all. I have a 2007 Prius and I’ve noticed that there are hardly any “regeneration cars” showing anymore. We used to have a normal amount of them. Now it’s always half a car/25wh of energy regenerated and it’s very rare. We will see a half a car sometimes every 30 to 45 minutes or even an hour. I drive a lot in town for work so I thought I would see a normal amount. Could this mean my traction battery is loosing re-charging capacity?