"*The TSM Average column is the Trailing Six Month Average. It is calculated in ...

"The TSM Average column is the Trailing Six Month Average. It is calculated in this way:
(ending_value/starting_value)^(1/num_periods-1)-1."

This is actually the formula for compound monthly growth rate, a modification of the commonly used compound annual growth rate (CAGR), with an extra -1 thrown in after num_periods. The correct formula for compound growth is:

    (ending_value / starting_value) ^ (1 / num_periods) - 1

The T6m average is the arithmetic average of, surprise, the last six months:

    T6m(x) = 1/6 * sum(x[1], x[2],..., x[6])

where x is a vector of the last 6 months' data (sales, users, etc.). The T6m average will be in the same unit as the monthly figures, not percentages.