How Has Teen Weed Use Changed in the Past 20 Years?

Complete the graph below, then click 'reveal' to see if your guesses are correct:

Percentage of 8th, 10th and 12th graders using marijuana per year: In 1997, 17.9%. In 1998, 16.9%. In 1999, 16.9%. In 2000, 16.3%. In 2001, 16.6%. In 2002, 15.3%. In 2003, 14.8%. In 2004, 13.6% In 2005, 13.4%. In 2006, 12.5%. In 2007, 12.4%. In 2008, 12.5%. In 2009, 13.8%. In 2010, 14.8%. In 2011, 15.2%. In 2012, 15.1%. In 2013, 15.6%. In 2014, 14.4% In 2015, 14.0%. In 2016, 13.7%