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].

Example Input: [-39, -78, -10, -56, 67, 4, 97, 31]
Example Output: [-58.5, -44.0, -33.0, 5.5, 35.5, 50.5, 64.0]

Example Input: [73, -32, -75, 39, -10, -15, 90, -89, -56, 40, -66, -89, -34]
Example Output: [20.5, -53.5, -18.0, 14.5, -12.5, 37.5, 0.5, -72.5, -8.0, -13.0, -77.5, -61.5]

Example Input: [-91, 100, -56, -75]
Example Output:
[4.5, 22.0, -65.5]