Brolga Bill's Bike Trail (BBBT)
'Twas Brolga Bill, from Rutherglen, that caught the cycling craze,
He turned away the good old wings that served him many days...
This geoart shows Brolga Bill's bike.
It is designed so you can be like Brolga Bill, and complete the trail by bike.
(and hopefully not come to the sticky end like his mate Mulga Bill)
All the puzzles are about bike riding, and can be solved with an easy online search.
The puzzle
Around the Bay in a Day is a non-competitive fully supported recreational cycling fundraising event organised by Bicycle Network in Victoria. Cyclists register to ride a course which is 210 km either clockwise or anti-clockwise around Port Phillip Bay, starting and ending in Melbourne, though other distances, both shorter and longer, are available.
Question: In 2012, over how many riders took part across the various distances?
You can validate your puzzle solution with certitude.