in src/admin.rs [381:389]
fn success_rate(&self, other: &Self, total: &'static str, error: &'static str) -> f64 {
let total = self.rate(other, total);
let error = self.rate(other, error);
if total > 0.0 {
100.0 - (100.0 * error / total)
} else {
100.0
}
}