UNA updates numbers mostly depend on whether we add major new features, minor features or just fixes. We do some planning, but more than half of the additions come from custom implemented projects we work on for our X-level clients. This helps to fund core platform development and make changes that really matter for live sites already in production. So, we often have to go by the situation at hand - if we had to add major changes, a major update is released. If we added smaller improvements and can package them, minor update is released.