Well, the interesting thing about penetration, it really relies on three factors. And obviously none of them are within our control regretfully. So, one is spread or what is the view of the credit volatility in the market. So, obviously, at the head of the pandemic earlier in 2020 that was pretty high as we saw the demand for insurance spike way, way up towards the early, middle part of the year. However, the other two components that have a huge impact are interest rates and spreads. Although they widened out, they immediately tightened as we got towards the end of the year. Except for the BBB, that still stayed reasonably wide. So, as we think about penetration going forward, obviously, the numbers have started to go up a bit. We had a 7% overall or a little over 7% overall penetration. If you break that down thought and look at the A-rated issuers, that penetration is still way over 50%. We say, can that migrate to a bigger part of the portfolio? We did more AA than we've ever done, the current year in terms of wrapping AA securities. I think the trend is positive, but while we still stay in a very low interest rate, almost zero interest rate environment with tight spreads, I'd be happy with the penetration that's starting to get up towards 10%. If we ever got to a normalized interest rate environment, and I get tired of saying that because I don't know what that means anymore, obviously, you can see significantly higher penetration rates, which will drive the strong financial guarantee business. And as Rob said, our core business, which is US public finance, the earned premium actually was up in the quarter, which means we're building that portfolio back again. We're seeing growth, the accelerated amortization, refunding slowed down significantly, and therefore, new business writings have now really started to add long-term earning value to the organization.