For every 100 girls

There are a lot of interesting facts with U.S. Census data to back it up.
For instance:

For every 100 girls that are conceived 115 boys are conceived.

For every 100 girls enrolled in gifted and talented programs in public elementary and secondary schools there are 94 boys enrolled.

For every 100 girls diagnosed with a learning disability 276 boys are diagnosed with a learning disability.

For every 100 women enrolled in college there are 77 men enrolled.

For every 100 women ages 18 to 21 in correctional facilities there are 1430 men behind bars.

http://boysproject.net/statistics.html