Renew license, keep credits

Currently, we have a 10 assets/month membership that is up for renewal in early July.  We plan to renew, but want to understand the policy when it comes to carrying over assets from year to year (renewal to renewal) as we have about 80 assets.  I understand that under this plan 120 assets can carry over month-to-month, but what carries over year to year if we renew?  Do we lose all unused assets because we are starting a new year renewal?  Or does the 120 carryover policy month-to-month act the same year-to-year if we are renewing?  I want to make sure we don't need to use up our assets before our early July renewal.  Thank you!