Notwithstanding how these are read, e.g. C can be Cmaj7 or other substitutions, that are understood by the musician and not always written or transcribed accurately, this analysis is akin to counting the number of times a digit 1 through 12 occurs in a financial statement and analyzing all annual reports. Or taking all the fiction books in the library and counting frequencies of characters translated to ascii codes. These are chords not chord progressions. Progressions would be i-iv-v, ii-v-i, and the prevalence of these. An interesting start, but the main meat of this analysis is unexplored.