The data displays the OTC (over-the-counter) volume sales of sleeping aid in the U.S. from 2011 to 2017. In 2013, OTC sales volume of sleeping aid in the U.S. reached around 62 million.
2011 | 37 |
2012 | 51 |
2013 | 62 |
2014 | 63 |
2015 | 63 |
2016 | 62 |
2017 | 60 |