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The survey has been taken every year now for 19 years. The number of reported walking trips has more than doubled since the first survey, from 18 billion in 1990 to 42.5 billion in 2009. Bicycling trips saw a similar increase, from 1.7 billion to four billion during the same period. The report also noted the population increase resulted in a greater number of overall trips and that progress is being made.
The full report can be read here.
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