Commuting in and out of the city

From SF1st.com:

"On the average weekday, San Francisco gains about 160,000 more bodies in the form of workers who commute in from various Bay Area counties, and counties even further to our north, south, and east. We learned that figure earlier this year via the American Community Survey, and it amounts to the difference in the number of people who commute in for work versus those who live here and commute outside of the city, like down the Peninsula, for work. We actually gain a total of 265,000 people each weekday, but lose 103,000 who reverse-commute out to the 'burbs. (The figure is based on data collected between 2006 and 2010, and given how much SF has changed economically in the last six years, and all of the awful traffic we now have, the daytime population has likely followed suit)..."

"Below, we have the map depicting reverse commuters who live in SF and commute outside the city 10 to 100 miles every day..."