What percentage of stop and searches led to finding a weapon in each year since 2016?

There are multiple grounds for a stop and search to take place. Information on arrests for weapon possession following a stop for any reason is published by the Metropolitan Police on the Stop and Search dashboard and can be found via the following link:

https://www.met.police.uk/sd/stats-and-data/met/stop-and-search-dashboard/

All stop & searches 1st January 2016 to 30th June 2021

Period

Total stop & searches

Outcome is weapon found

% where weapon (s) found

2016

148,467

3,883

2.6%

2017

130,736

4,199

3.2%

2018

151,679

4,255

2.8%

2019

268,886

5,177

1.9%

2020

320,192

5,308

1.7%

2021

(to June)

129,937

2,495

1.9%