It’s not just you. The federal government has become less responsive and more stingy with FOIA requests across agencies and types of requests, according to Still Waiting
After All These Years:An in-depth analysis of FOIA performance from 1998 to 2006. The report author, Coalition of Journalists for Open Government headlines the findings:

Backlog: Two of every five requests filed in 2006 were not processed

Caseload: Requests fell for the second straight year, but the backlog still increased

Waiting Time: Long waits for information continue

Information Released: Full grants hit an all-time low

Appeals: Don’t bet on winning, the odds are against it

Costs, Efficiency: More spent on processing by fewer hands

FOIA Fees: Charges pay an insignificant part of the costs

Exemptions: Citations on the rise, particularly regarding law enforcement

Expedited Requests: No real gain for those not rejected outright

Apparently the federal government doesn’t fear its citizenry…