Figure 2
The horizontal axis is marked with years and ranges from 2001 to 2021 in increments of 5-year intervals. The vertical axis ranges from 0 to 10 in increments of 1 unit. A single line with circular markers represents the distribution of articles by year of publication. The line begins at (2001, 3), drops to (2002, 0), rises to (2003, 1), drops to (2004, 0), remains constant through (2005, 0), rises to (2006, 1), drops again to 0 through 2009, rises sharply to (2010, 5), drops to (2011, 2), rises to (2012, 3), drops to (2013, 2), falls to (2014, 0), then climbs steadily from (2015, 4) to (2017, 8), dips to (2018, 6), peaks at (2019, 9), drops to (2020, 4), rises to (2021, 5), then sharply falls to (2021, 1). Note: All numerical data values are approximated.Distribution of articles by year of publication. Source(s): Authors’ work