I now have continuous data for the last four years of running--See posts 2012, 2013, 2014.
Year Total miles, Pace, Barefoot miles, Pace, Miles with Shoes, Pace
2012 1,502.13 7:57 640.65 7:50 861.48 8:03
2013 1,571.55 7:58 577.77 7:49 993.78 8:03
2014 1582 1/2 7:55 446 7:47 1136 7:58
2015 1573.61 7:57 334.09 7:48 1239.52 7:59
One may easily note that there is a steady decline in barefoot miles and yet the overall pace is pretty similar, with 2004 being a kind of banner year. Barefoot running is consistently faster than with shoes, but I have come to think of it as more of a training aid than a place to accomplish conditioning. It keeps my running smooth, so that I can run without injury. Now that I have better form, I do not need to rack up so many barefoot miles to keep me under 8:00--I have run sub 8 with shoes the last two years.
An additional note: I was 70 miles in the hole at the end of Feb, due to heavy snow. It took me most of the rest of the year to make up all those miles.