The CPI-W for January 2018 was 241.919, a significant increase over the previous months in yellow above. It is also significantly higher than the benchmark average circled in green above. That average is 239.668
The 2019 COLA will be determined by how much the average for July, August and September 2018 exceeds the 239.668 average for the same months in 2017. The total average CPI-W since September 2017 now stands at 240.921 with an upward trend.