Image World Heritage Sites histogram 30 Sunday Mar 2014 Tagslinear regression; UNESCO; extrapolation UNESCO sites visited per year with linear regression line. Sep 2008: 50 sites Mar 2014: 100 sites Apr 2019: 150 sites (projected) Feb 2023: 200 sites (projected) NB: 2014 contains Jan – March only. Posted by jmsinusa | Filed under Maths, UNESCO ≈ Leave a comment