2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, and 2015. Fusco, Emily J., Finn, John T., Balch, Jennifer K., Nagy, R. Chelsea, and Bradley, Bethany A. Data for 'Invasive grasses increase fire occurrence and frequency across U.S. ecoregions' (https://doi.org/10.1073/pnas.1908253116). File geodataba... University of Massachusetts Amherst.