When using proxy IP for your LAN connection to bypass firewall, can work still monitor the internet activity?

-Ive been using proxy IP addresses in my LAN connections to bypass our firewall here at work for months. I havent gotten in trouble for this yet. Im just curious to know if my work can still monitor my activity on web sites ive accessed, or how much bandwidth im using when viewing photos/videos and such. Im pretty computer savvy, but this is one thing im unsure of. I would like to feel 100% confident that im safe and free to view the content i want without getting in trouble by 'Big Brother'. Any help would be greatly appreciated. Thanks a bunch! :-)The way a proxy works is that every single message you send appears to be going to and coming from the proxy. So they can still see how much bandwidth you're using, they just can't see where you're getting it from (unless they intercept the proxy's messages, which is possible to do, although unlikely)
YES, they can!



Your at work and those are THEIR machines.



Use your own machine and ISP that you pay for to do YOUR surfing.