Given the task definition and input, reply with output. In this task you are given a list of numbers and you need to find the average of each two consecutive values. The average of two numbers a and b is calculated as: (a + b) /2. The output should be a list of the averages of each two consecutive values. A list is presented with two brackets and comma-separated values, like: [1,2,3].

[-38, 79, 86, 0, -9, 68, -74, -84, 20, -93, -34, 57, -63, 40, 85]

[20.5, 82.5, 43.0, -4.5, 29.5, -3.0, -79.0, -32.0, -36.5, -63.5, 11.5, -3.0, -11.5, 62.5]