Sorry, you are right. I was off by a year. It started in 2017.Thank you for your feedback. I appreciate your feedback. The interest to apply existed prior to 2018. There was the highly controversial first-come, first-served system in 2017. Kindly see below. https://www.cicnews.com/2017/01/new-interest-sponsor-form-parent-grandparent-program-goes-live-018772.html/amp
But your survey is still wrong.
Before 2017, there was no EOI. It was FIFO for around two of years before that. There was no EOI pre-2017. People submitted their full applications on a first come first serve basis. Before that, there were a couple of years where applications were on hold. And before that, anyone could apply who met LICO but IRCC only processed so many per year leading to a 12+ year processing backlog.
You use the term expression of interest in the question and include dates for 2011 and 2016. There was no EOI during these years.