The single-line chart is titled “Prevalence of Gang Problems in Study Population, 1996–2007.” Displayed horizontally are years from 1996 to 2007, and displayed vertically are percentages from 0 to 50. Prevalence rates for each year are presented as data points. The heading titled “Prevalence of Gang Problems in Study Population, 1996–2007” includes bullet points that describe the trends of this single-line chart.
Specifically, prevalence of gang problems by survey year is as follows: 39.9 percent in 1996, 39.2 percent in 1997, 35.7 percent in 1998, 31.5 percent in 1999, 26.9 percent in 2000, 23.9 percent in 2001, 27.8 percent in 2002, 30.1 percent in 2003, 28.8 percent in 2004, 33.6 percent in 2005, 33.3 percent in 2006, and 34.8 percent in 2007.