Top Large Cities for Walking (More Than 250,000 Residents)

City - Population - % Walking to Work
1. Boston, Massachusetts 589141 13.36%
2. Washington, DC 572059 12.27%
3. New York City, New York 8008278 10.72%
4. Pittsburgh, Pennsylvania 334563 10.02%
5. San Francisco, California 776733 9.82%
6. Philadelphia, Pennsylvania 1517550 9.22%
7. Newark, New Jersey 273546 8.03%
8. Seattle, Washington 563375 7.72%
9. Baltimore, Maryland 651154 7.28%
10. Minneapolis, Minnesota 382452 6.85%

If you rank the largest cities by the % that bike to work, Newark is not within the top 25. Why is that?