Stats.

2013 Stats
Here is a breakdown of the boxes collected in Canada for 2013.

Girls
age    2-4           10%
         5-9           31%
         10-14       15%
                         56%

Boys
age  2-4              8%
       5-9            24%
       10-14        12%
                        44 %

Canadians packed...
664,066 in 2013
662,312 in 2012.
672,274 in 2011
640,714 in 2010

World Wide
9,039,060 Shoe boxes were collected in 2012
8,630,568 in 2011
Since 1993 103,720,570

 Source: OCC Canada