20k identifiable pieces of trash, small sample size. Even if it's good math ~ perhaps its a numbers game of popularity in brands? Coke was 15% Pepsi 10% ... and

20k identifiable pieces of trash, small sample size. Even if it's good math ~ perhaps its a numbers game of popularity in brands? Coke was 15% Pepsi 10% ... and I'm sure other brands of aluminum can waste we're their proportional share..