From the data shown, determine the ESL of the asset. (Note: Values in the table are AW values, not individual year-end values.)

Years Retained AW of First Cost, $ AW of Operating Cost, $ AW of Salvage Value, $ 1 -136,000 -42,000 99,000 2 -138,000 -50,000 38,095 3 -136,000 -37,000 18,127 4 -148,000 -47,000 6464 5 -130,000 -51,000 3276

The ESL of the asset is year(s).