Raw number like this, don't really tell us a lot, without the detail behind each situation. There is no question the police use excessive force at times. The question is; what is the percentage of excessive force vs when the situation called for using excessive force.
What would be really useful are statistics mapping out the following:
#1) The probable cause for which an officer initially approached the citizen
#2) The actual offense the officer arrested the citizen for
#3) Classification of the probable cause and classification of the actual offense (i.e. violent felony, trivial non-violent misdemeanor, etc)
#4) Extent of injuries.
Here is an example I saw on youtube.
A 76 year old man was pulled over because his license plate lacked registration tags.
The 76 year old man told the officer that he was a car dealer and was exempt from registration tags.
The officer directed the man out of the car, the man got out of the car and went to the back of the car and pointed at the dealer tags and again explained to the officer that he was exempt
Officer directed the man to put his hands behind his back while simultaneously grabbing the man's arm
76 year old man pulled his arm back and said, "What are you doing? I told you I'm exempt"
Officer then body slammed the 76 year old man on the asphalt for "resisting arrest"
Veteran officers arrive on the scene and explain to the officer that the man was in fact correct, he was exempt
76 year old man "initially" charge with resisting arrest
Case dropped once media got ahold of the footage...
Now, in the above case, for the sake of argument, lets say the officer was 100% correct. In this case, all that should have happened was a ticket should have been written. That's it. Trivial misdemeanor, no big deal. However, the officer got "annoyed" and felt he was being "disrespected" so he elected to escalate the situation to physical violence and you end up with the ubiquitous charge of "resisting arrest".
I submit:
When the officer approaches a citizen with probable cause for XYZ and then the officer arrests the citizen for XYZ then vast majority of the time, officer will be in the right.
However, when an officer approaches a citizen with probable cause for XYZ and the citizen disproves the probable cause for XYZ but then the officer subsequently arrests the citizen for "obstruction of justice, trespassing, disturbing the peace, or resisting arrest" then I submit a majority of those situations will just be a butt hurt bruised ego cop escalating a situation just so he can arrest you on trumped-up charges.