I just published a new hub about the newborn lambs and I noticed that the url only shows 'Lambing Season' and not 'Lambing Season 2016'. I didn't change that. All my Lambing Season hubs have a year at the end of their url, so why not this one???
I just started a new hub to find out and indeed, if I enter the Title 'Lambing Season 2016, or 2017 the numbers disappear in the url and all that's left is lambing-season.
So what's the point in not showing the year in the url I wonder.
This is very strange, especially because your previous "lambing season" hubs (2011 - 2015) do have the year in their URLs. I think I'd drop the team an email if I were you. Or perhaps you could use Roman numerals for the URL.
I love the 2016 hub, by the way. How's my Lance doing?
While you can use a Hub title that is already in use on HubPages, you can not use a URL that has already been taken. If you are not able to input the year at the end, it sounds like someone may have already claimed this URL to write his/her own Hub.