Well, Rich, I think you've nailed it from our perspective, and I appreciate the way you framed that, because it's the way the entire organization looks at the index complex. So I'll borrow on a few of the words that were in the prepared statement. But really, if you look past the incredible records of the first quarter and look at April, you're right on the way we view the complex in the shift in products -- product and its utility. So, if we figure last year we averaged 2.2 million to 2.3 million contracts in that complex, that's where April is. The difference is really to your point in the shift. So what causes that? VIX products and their utility are great hedging tools early in the change of perceived risk. The vol spikes, so think January where the market peaks, two weeks later the market is down 10%. That is an incredibly powerful vehicle using VIX products to hedge in that case. The market then heats up, and that's the market that we're in today vol service is flat, which means we still think we're in transition. The market hasn't said what it perceives risk over time yet. That's that flat volatility surface. Well, what suffers? VIX Futures. It's hard to express a difference or said differently, it's hard to capture the difference in the price of future risk versus today's risk because the market has said, "We don't see a big difference now." That's very, very unusual, but what's happened in the meantime, yesterday, no better example of how traders have shifted in the S&P 500 complex. From the prepared remarks you'll recall we said the S&P 500, those intraday moves, 3x greater than we saw in the fourth quarter 2017. So, by using the S&P 500 as your hedging vehicle, those intraday moves like yesterday allow you to take advantage of a move that's really unusual if you look out over time and monetize the hedges that you're putting on by using the S&P 500 instead of VIX Futures. Now, that scenario of flat volatility doesn't last long historically. It's unusual in this instance, but we believe history is what we look back to and we'll go to a normal upward sloping curve in vol, which then reignites the volatility strategies that allow you to trade up and down the volatility surface. The punch line is that we have a product that serves our users in any market environment if you can interchangeably understand the utility of VIX futures, VIX options and the SPX complex. That's the way we see it.