MEXICO CITY—Mexico’s death toll from the coronavirus pandemic is likely at least 60 percent higher than the confirmed number, putting it in excess of 300,000, according to government data. Updated figures on excess mortality in a table published by Mexico’s Health Ministry showed that by the end of the sixth week of this year, 294,287 fatalities “associated with COVID-19” had been registered on death certificates in Mexico. That was 61.4 percent higher than the confirmed death toll of 182,301 given as a comparison in the same table. That figure did not coincide precisely with a specific day from the Health Ministry’s daily bulletins, but more than 25,000 COVID-19-related deaths have been reported since mid-February. As of Sunday, the ministry’s confirmed toll stood at 201,623. The government has long said Mexico’s real tally of COVID-19 deaths is likely significantly higher than the confirmed toll, which is one of the highest worldwide. Relatively …