Study: 2015 Trustwave Global Security Report
Date: June 9 2015

The corporate passwords that were cracked fell into the following character types & combinations (n=441,960):

59%	Lowercase + Uppercase + Number
17%	Lowercase + Uppercase + Number + Special
9%	Number + Special
9%	Lowercase + Number
3%	Lowercase Only
1%	Lowercase + Uppercase + Special
1%	Lowercase + Number + Special
<1%	Uppercase + Number + Special
<1%	Uppercase + Number
<1%	Number Only
<1%	Lowercase + Special
<1%	Lowercase + Uppercase
<1%	Uppercase + Special
<1%	Uppercase Only
<1%	Special Only

"Encouragingly, this year we did see an increase in the number of passwords using multiple character types. While the most common combination of characters in 2013 was only lowercase letters and numbers, this year it fell to the fourth spot."