There's a list of the ceremony dates at https://en.wikipedia.org/wiki/National_Rhythm_%26_Blues_Hall_of_Fame, along with a list of inductees that can be sorted by year inducted if you click on the arrows at the top of the column. Hope that helps.

I understand. I had gone to their website earlier because I thought I would post the info about the new inductees from there. However, I didn't feel that the website was that well-designed and so I went with the Billboard item instead (which was how I had found out about the inductees anyway). 

I think that their focus is on having a more "artistic" presentation of info, something I've noticed in the past with the Rock and Roll Hall of Fame site as well. I go to Wikipedia a lot for all kinds of info, because often it's the quickest way for me to find what I'm looking for -- and while incorrect info can be posted there, I think that there are enough people watching out for inaccuracies for this to normally be a concern.