Your feedback number( 136) isn't just for the last 12 months. It stays there for good and increases with more feedback given for more transactions

Only the feedback % goes back to zero if no transactions have been made within the last 12 months.

ebay used to remove all feedback ( including positive ) left  by users who are no longer registered within 90 days of joining but I'm not sure if that still applies. That may have happened to you.