Cancer Mortality Reduction Over the Last 30 Years

There's a really good by the way if you haven't read the Emperor of all maladies. Siddhartha Mukherjee I highly highly recommend him because he dives deep into exactly this. One thing that is interesting statistically is what's called lead time bias. If you get better at diagnosing cancers at an earlier stage it will appear as if people survive longer with cancer. Just from that fact alone. Even if they're not getting better treated. But all right but let's go back to say 1991. When you know that's like so that's the last 30 years. From 1991 to 2020 for 1991. For 1991. Give me one percentage for the last 30 year. How are