In response to Bek below ...
That is not what I wrote. I don't think that these figures are conclusive regarding driver attention. Even if one thought they were conclusive, there are a lot of dimensions outside of what accidents per mile would address. It is perfectly plausible that driver attention has remained the same since 1990 but that conditions are worse for cyclists since 1970.
Mind you, I have only been (legally) driving since 1988.