(1) For purposes of M.G.L. c. 152, § 35C, for claims involving compensation pursuant to M.G.L. c. 152, §§ 34, 34A or 35, applicable benefits on the first date of eligibility for benefits shall be based on the employee's average weekly wage as of such first date of eligibility for benefits, or, if the employee is not employed on that date, it shall be based on the employee's average weekly wage as of the employee's last date of employment. For claims involving compensation pursuant to M.G.L. c. 152, § 31, applicable benefits on the first date of eligibility for benefits shall be based on the employee's average weekly wage as of such first date of eligibility, or, if the employee is not employed on that date, it shall be based on the minimum compensation rate provided in M.G.L. c. 152, § 31.