An update:

To date since the solo campaign(s) started in July 2014 the following have been played:

2014 3 Solo games were played 19 times

2015 12 solo games were played 54 times

2016 12 solo games were played 62 times (1 to come, to date)

2017 2 Solo games were played 4 times (to date)

A big thank you to all the scenario writers and players who have taken part.