# Why FDI stock in the same year is different in the same reports?

From World Investment Report 2003, in 2000, the US has 12.4% GDP as FDI inward stock and 13.2% GDP as FDI outward stock. These numbers are equivalent to 1274720 million USD, and 1356960 million USD. With GDP US in 2003 as 10.28 billion USD.

From World Investment Report 2007, in 2000, the shares above are 12.8 and 13.4, respectively.

From World Investment Report 2017, however, in 2000, the US has 2783235 million USD as FDI inward stocks, and 2694014 million USD as FDI outward stock. If we measure in percentage as above, we would have 27% and 26% equivalently.

Why are the numbers are so different? Do I forget something like the price levels or so?

• These will be changes in information provided by the US Government to UNCTAD: compare the US data ($1,214,254-1,256,867-2,783,235$ and $1,293,431-1,316,247-2,694,014$ million dollars) with the comparable Austrian numbers in the same tables ($30,431-30,431-31,165$ and $24,820-24,821-24,821$) to see they do not have to change. My guess is that small changes may be driven by new information while large changes may be associated with domestic methodology and definitional issues – Henry Apr 13 '18 at 17:10