Here we analyze the nonce values and hashes for all the valid blocks in the blockchain:
Nonces vs Hashes (y-axis logarithmic, x-axis linear)
This plot readily shows that the distribution of nonces that produce valid hashes is uniform.
Nonces vs Hashes (log-log scale)
In the animated version of this last plot, you can really visualize the change in the difficulty and even see where the difficulty was decreased.
The nonces found are skewed toward 0 because this is a selection effect: most everyone starts searching for nonces starting at 0:
Although the distribution of hashes is not uniform, this does not matter; all that matters is that the distribution of nonces is uniform (which they are, minus the selection effect of starting at 0):
2-D histogram of hashes and nonces (logarithmic color scale):
This also illustrates very well that the distribution of nonces is uniform.
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