§ 11. Temporary partial disability benefits. In the case of temporary partial disability the volunteer ambulance worker shall be paid for each week during the continuance thereof, as follows:

1. If the percentage of loss of earning capacity is seventy-five per centum, or greater, he or she shall be paid one hundred fifty dollars for each week, provided, however, that the volunteer ambulance worker is injured in the line of duty on or after the effective date of this chapter to and including June thirtieth, nineteen hundred ninety, provided, however, that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety to and including June thirtieth, nineteen hundred ninety-one, such payment shall be two hundred eighty dollars for each week, provided, however, that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety-one to and including June thirtieth, nineteen hundred ninety-two, such payment shall be three hundred fifty dollars for each week; and provided further that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety-two such payments shall be four hundred dollars for each week.

2. If the percentage of loss of earning capacity is fifty per centum, or greater, but less than seventy-five per centum, he or she shall be paid one hundred dollars for each week, provided, however, that the volunteer ambulance worker is injured in the line of duty on or after the effective date of this chapter to and including June thirtieth, nineteen hundred ninety, provided, however, that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety to and including June thirtieth, nineteen hundred ninety-one, such payment shall be one hundred eighty-six dollars and seventy-six cents for each week, provided, however, that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety-one to and including June thirtieth, nineteen hundred ninety-two, such payment shall be two hundred thirty-four dollars and fifty cents for each week; provided, however, that when the volunteer ambulance worker is injured in the line of duty on or after July first, nineteen hundred ninety-two, such payment shall be two hundred sixty-eight dollars for each week.

3. If the percentage of loss of earning capacity is twenty-five per centum, or greater, but less than fifty per centum, he or she shall be paid thirty dollars for each week.

4. If the percentage of loss of earning capacity is less than twenty-five per centum, he or she shall not be paid any weekly benefit.

Temporary partial disability, within the meaning of this section, shall exist only if the earning capacity of the volunteer ambulance worker has been temporarily and partially lost as the result of the injury. The workers' compensation board shall determine the degree of such disability and such board may reconsider such degree on its own motion or upon application of any party in interest.