The serious adverse event definition and rates are defined here: https://health-infobase.canada.ca/covid-19/vaccine-safety/ut...
1 in 9000 doses reportedly results in a SAE, so if you are mandated to take 4 doses, your risk becomes ~0.04% or ~1/2500.
This also does not factor in the risk of "adverse events of special interest", which can be serious or non-serious (though neither seems great for the end user).
And looking at how this page has been updated since the last time I saw it, another red flag is how they separate those out - with a dead link to boot. In my opinion a continuation of efforts that seem intent on obfuscating the ability to make individual risk calculations through this pandemic.