The referendum was set at the same time the assembly was established. But at that time, we didn't know that it was going to be a double 60% supermajority. When we all signed up, we thought it was a usual 50% majority referendum. We were only told about the double 60% several months into our process, and we all just sat there thinking that this proposal was doomed. We didn't think it would work, although we really did like the requirement to get 50% in the different districts. That forced us to make sure we satisfied the requirements and needs of rural voters, which we could have avoided otherwise.
On September 27th, 2016. See this statement in context.