Blocked URL's by robots.txt

[meralucian37]

In Google Webmaster Tools shows me 10,936 Blocked URL's by robots.txt and it is very strange when you go to the "Index Status" section where shows that since April 2012 robots.txt blocked many URL's.

You can see more precise on the image attached (chart WMT)

I can not explain why I have blocked URL's ? because I have nothing in robots.txt.
My robots.txt is like this:

User-agent: *

I thought I was penalized by Penguin in April 2012 because constantly i'am losing visitors now reaching over 40%. It may be a different penalty?

Any help is welcome because i'm already so saturated.

Mera

robotstxt.jpg

[Highland]

You can also exclude URLs by meta tag. Do you have any meta tags like those on this page?

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=93710

[Mark_Ginsberg]

Check in webmaster tools what Google is seeing for your robots.txt - this will confirm what you see is what Google is seeing

Can you paste the full text here?

[meralucian37]

I attached the image

robotstxt1.jpg

[meralucian37]

I don't have any meta tags to block URL's

[Mark_Ginsberg]

I just checked your robots file, and I see this:

User-agent: *

Disallow: /cars/index

Disallow: /cars/details

[meralucian37]

I added the 2 lines several hours because i saw that Google had crawl some zend routes.

I changed the entire content of the website 2 weeks ago and during this process i notice the problem.

Many thanks Mark for your help.