CREATE TABLE table_76085 ("Name" TEXT, "Year commissioned" FLOAT, "Gross head  ( metres ) " FLOAT, "Installed capacity  ( megawatts ) " FLOAT, "Average annual output  ( million KWh ) " FLOAT)

What is the Year commissioned of the power station with a Gross head of 60 metres and Average annual output of less than 59 million KWh?
SELECT MAX("Year commissioned") FROM table_76085 WHERE "Gross head (metres)" = '60' AND "Average annual output (million KWh)" < '59'
SELECT MAX("Year commissioned") FROM "table_76085" WHERE "Average annual output (million KWh)" < '59' AND "Gross head (metres)" = '60'