Original: The IPCC published its first assessment report in 1990, a supplementary report in 1992, a second assessment report (SAR) in 1995, and a third assessment report (TAR) in 2001.
Simplified: IPCC Reports The first IPCC report was published in 1990. The second report was published in 1995, the third was published in 2001, and a fourth in 2007.