This post compares the WZ and ICCF number and share of Tournament Directors Level 2 and International Arbiters. For comparison the count and share of players is provided. There is no data available for Level 1 TDs.
The comparison shows that the share of WZ TD Level 2 and International Arbiters is comparable to the number WZ number of Players in the 2020/2 ratings. All three are between 20.2% and 22.5%.