I can only agree with Garry's arguments. Exact figures will not be found on the honorary certificates (Ehrenurkunde). I have compiled and translated a few things from Buddrus on the RBWK (I hope that everything is reasonably comprehensible).
Warning: extremely long and perhaps also boring article, based on Buddrus, chapter 7.2
Some facts and figures on the RBWK
In 1934, the first year, 500,000 young people took part, which in a multi-stage selection process comprising 15 occupational groups and four - later twelve - performance classes at local (Ort), district (Kreis) and regional (Gau) level to determine the participants in the final competition, which took place on 27 April 1934 in Berlin.
The 15 winners (Reichssieger) got a ceremony with Hitler on 1 May 1934, later every year.
In the 2,000 localities in which in 1934 about 56,000 local and 2,200 Gau winners were determined, 500 of whom took part in the Reichsendausscheid.
The participants in the Reichsberufswettkampf had to pass theoretical and practical vocational examinations as well as (of course, because hey it's HJ) ideological and sporting inspections.
In the three-part occupational theory part of the Reichsberufswettkampf, occupational questions on the subjects of materials science, tool science and the execution of work had to be answered in four hours, a closed work process had to be described, the relationships and tasks of one's own occupation within the framework of the overall economy had to be presented, knowledge of rationalisation had to be demonstrated ("fight against spoilage", "utilisation of old material", substitution of raw materials) and socio-political questions ("beauty of work", protection at work and accidents) had to be discussed; in addition, there were tasks in technical arithmetic and an essay. In the practical vocational part, mostly products typical for the occupation had to be produced or corresponding skills had to be demonstrated in four hours.
Number of participants in Reichsberufswettkampf: 1934 - 500,000; 1935 - 750,000; 1936 - 1,036,000; 1937 - 1.8 million; 1938 - 2,078,966 youths and 623,967 adults; 1939 - 3.5 million youths and adults,
including more than one million girls or young women. From 1938 onwards, adults could also participate, but there were not very many of them.
The aim from 1936 onwards (rearmament in the course of the Four-Year Plan) was to train more skilled workers and have fewer unskilled workers.
In "Professional Practice" the participants achieved the following results in 1937,
in brackets the values of 1936, figures in percentages: Note 1 (best grade, A) - 9.5 (5.7); Note 2 (B) - 34.8 (34.4); Note 3 (C) - 44.2 (38.1); Note 4 (D) - 11.5 (22.1); the "Reichsübersicht über die Ergebnisse der Berufstheorie" lists the following results: Note 1 - 6.0 (2.4); Note 2 - 35.2 (30.4); Note 3 - 39.0 (41.3); Note 4 - 19.8 (25.9);
Here one could derive a slight indication of the quantity of honorary certificates (Ehrenurkunde).
At the final competition of the Reichsberufswettkampf 1938 in Hamburg, 6,352 of about 37,700 Gaus winners took part.
With the start of the war, the competition went into hiatus; I'm omitting the revival in 1943/44, which was quite a flop, otherwise the article will become really exhausting.
On numbers, there is a table here aiming to consolidate them: 
) . I was so busy translating that I didn't search through everything again beforehand. 