That's probably just total goals conceded from set pieces, and since we didn't present other teams with that many set pieces, it may not be as impressive as it seems. It would be more relevant to look at the percentage of set-pieces leading to goals. If we're amongst the league's best in that category, then fair play.
Go on. Prove we didn't concede many compared with other teams as I'm calling that bullshit.
I was merely making the point that some numbers might be misleading, and if there's going to be a proper discussion, no one should be afraid of more data (however it turns out). I have no agenda - I thought my last sentence would make that clear.
However, you did succeed in goading me into wasting a couple of hours searching for data... Not that I was able to find the exact stats to answer the question I was asking, but I did find some information that's probably relevant.
First of all, the point I was making was that just assuming we were good at defending set pieces because we didn't concede many goals from set pieces is like saying our goalkeepers were shit because they made fewer saves than any other teams' goalkeepers (64 total compared to 176 for Sunderland - that proves Pickford was sh*t hot, right?). The more relevant stat for saves would be percentage of shots saved, just like the more relevant stat for set piece goals conceded would be percentage of set-pieces from which we conceded a goal.
The next point is that according to WhoScored we actually conceded more goals from set pieces than Arsenal, Chelsea, United, and Spurs (and WBA), and were only 13th best at scoring from set pieces (but that's a different discussion). That puts us near the top in terms of fewest conceded, but still doesn't show how effective our defence was at defending set pieces.
The only stat I could find that might help is the number of corners conceded, and that shows that we conceded fewer corners than any other team last season (3.45 per game - from Corner-stats.com). I wish I had numbers for free kicks around the box as well, but as I don't, I don't think it's unreasonable to correlate the number of corners conceded with the number of set pieces conceded, since both relate to the amount of pressure the defence is under. So, if you use corners as a proxy for set pieces, then you can come up with a ratio of number of corners to goals conceded from set pieces, which should be a reasonable guide to how well we defended set-pieces last season. Our number comes out to 1 set piece goal conceded for every 14.5 corners conceded, which ranks 15th in the league (Watford, Hull, Southamptom, Palace, and Liverpool, in that order, round out the bottom - Liverpool conceded 1 set piece goal for every 11 corners conceded). Arsenal were top with 1 per 31 corners conceded, and Chelsea (1:23), United (1:21), and Spurs (1:19.5) were all in the top 6 (along with WBA and Burnley).
Of course this analysis is far from definitive and doesn't answer any questions about Bravo v Willy, but it's far better than just considering numbers of goals conceded from set-pieces, and suggests that we absolutely did have defensive issues when it came to set pieces last season. It also suggests that despite this, we can still all laugh at Liverpool.