How many people know about outside hacker are looking for your information.
Let me write some of information is the below link site and brife inforamtion.

Due to the lower propertion of internal threat agents, Misuse lost its pole position among the list of threat action categories.
Hacking and Malware have retaken the lead and are playing dirtier than ever.
Absent, weak, and stolen credentials are careening out of control.
Gaining quickly, however, is a newcomer to the top three-Physical.
After doubling as a percentage of all breaches in 2009, it managed to double again in 2010.
Maybe cybercrime is getting less "cyber"? Misuse and Social, though lower in percentage, were still high in number and provided some amazing examples of misbehavior, deception, and plotting for the highlight reel.

Reference.
" 2010, 2011, 2012 Data Breach investigations Report"

http://www.verizonenterprise.com/resources/reports/rp_data-breach-investigations-report-2011_en_xg.pdf