How it has improved over time?
I'd like to see that myself.
Me too. At this opportunity I'll mention that even the 2019-5 version is already outdated in at least one respect: the beginning of the Cambrian is given there as 541.0 ± 1.0 Ma ago, but really happened later, between two volcanic-ash beds dated to 538.58 ± 0.19 and 538.99 ± 0.21 Ma ago.
Linnemann, U., Ovtcharova, M., Schaltegger, U., Gärtner, A., Hautmann, M., Geyer, G., Vickers-Rich, P., Rich, T., Plessen, B., Hofmann, M., Zieger, J., Krause, R., Kriesfeld, L. and Smith, J. (2018, printed 2019) New high‐resolution age data from the Ediacaran–Cambrian boundary indicate rapid, ecologically driven onset of the Cambrian explosion. Terra Nova 31, 49–58. doi: 10.1111/ter.12368