Currently, the statistics chart includes the exact time and date of the given point but does not tell you the year. If you have been operating a nation for several years, you have to manually count each date backwards to figure out when the number at the given point was true. The exact year is surely clearly known, as they are shown along the bottom of the graph, but again, when you have thousands of given points it becomes impossible to accurately estimate the year when it is only given in three month increments.
I do hope this change will be considered, it would be a nice addition especially for nations that have spanned very long periods (10+ years).
Thanks, -Krimzen