What percentage of VA disability claims are denied?

For the year that we have the most recent data, almost 40% of all VA disability claims are denied. According to the VA’s 2020 report, of the cases that were denied:
VA Disability Appeals Approved at the BVA
40.9% approved with an attorney
33.0% approved with VFW representative
31.7% approved with DAV representative
31.8% approved with AMVETS representative
26.2% approved with no representative
VA Disability Appeals Denied at the BVA
14.8% denied with an attorney
21.8% denied with VFW representative
20.9% denied with DAV representative
19.0% denied with AMVETS representative
29.2% denied with no representative