This is a slight improvement since the great recession. But not a huge swing since 1995 when they started charting this statistic.

The BLS has been tracking data on employment in families since 1995. That year, the percent of families in which no one had a job was 18.8 percent. The percentage hit an all-time high of 20.2 percent in 2011. It held steady at 20 percent in 2012 and 2013. In 2014, it declined to 19.9 percent.
http://cnsnews.com/news/article/ali-meyer/1-5-families-us-no-one-works