To Eric_R: You are very fortunate to have such an active dive shop that encourages regular diver participation. However, based on the figures you mentioned, it looks like overall participation, since the time you started monitoring it, has slowed down. Am I reading you right?
To the others who have responded (and others that have yet to opine): If you have been diving for more than 10 years, have you noticed a decline in diver participation, particularly at inland (quarry/lake) sites?
If so, please tell me what you believe are the reasons for that.
Thanks