Thank you mcgowanjm for bringing this up. I've been trying for three days, but maybe some numbers will get people involved.

We've used 1000 Gb. If we have past 50% some time ago, that means we could be well into the 60s.

1000 /.60 = 1,666.67

1000 /.65 = 1,538.46

1000 /.70 = 1,428.57143

Overall, if we have used 60% of URR, the average decline rate will be much higher than if we were at 50%.

Which is why I asked if most countries use techonology that has delayed their peak...

Also, how much will the countries that are ramping up production offset the decline rate?

I should have said, "will get more people involved"