The Australian Bicycle Council released the results from their 2013 Australian Cycling Participation Survey.
It seems that the survey, whilst following the 2011 template, slightly altered the wording in some of the questions. Perhaps this explains why the survey suggests that participation rates have decreased by 3.9% between 2011 and 2013 ( 2011: 22.1% 2013: 18.2%). The survey is based on 884 households and 2128 individuals, and the decrease is from 512000 to 405000 people cycling in a typical week.
The report notices the marked decrease in cycling participation in the metropolitan area, where 13.1% of riders said they were riding more frequently vs. 39.3% who said they were riding less frequently (47.3% were riding the same). Only 3% of respondents have taken up cycling in the last year.
Participation rates are about four times higher amongst in the under-18 age group compared with the over-18 age group, and overall in WA more than double as many people ride for recreation than for transport. The overall decrease in cycling participation appears to be in recreational cycling.