From Google Official Blog:
We’re updating the Transparency Report with data about government requests from January to June 2012.
This is the sixth time we’ve released this data, and one trend has become clear: Government surveillance is on the rise. As you can see from the graph below, government demands for user data have increased steadily since we first launched the Transparency Report. In the first half of 2012, there were 20,938 inquiries from government entities around the world. Those requests were for information about 34,614 accounts.