Top 25 Prospects in the Last Two Years

WTF do these numbers mean?

1
Last Updated: July 9, 2019
.919
2
Last Updated: May 21, 2018
.890
3
Last Updated: September 23, 2018
.808
4
Last Updated: July 9, 2019
.757
5
Last Updated: July 9, 2019
.756
6
Last Updated: September 23, 2018
.754
7
Last Updated: July 9, 2019
.747
8
Last Updated: June 18, 2019
.725
9
Last Updated: May 21, 2018
.702
10
Last Updated: August 27, 2017
.701
11
Last Updated: July 9, 2019
.693
12
Last Updated: July 9, 2019
.682
13
Last Updated: July 19, 2018
.680
14
Last Updated: September 23, 2018
.678
15
Last Updated: July 14, 2019
.674
16
Last Updated: September 23, 2018
.656
17
Last Updated: July 9, 2019
.655
18
Last Updated: September 23, 2018
.649
19
Last Updated: August 5, 2018
.646
20
Last Updated: July 9, 2019
.646
21
Last Updated: July 14, 2019
.645
22
Last Updated: July 19, 2018
.641
23
Last Updated: July 9, 2019
.631
24
Last Updated: July 9, 2019
.631
25
Last Updated: July 9, 2019
.629

What Jeff thinks.