E Estimate based on partial or uncertain data.

NA Not available.

0 Nil or negligible.

R Rough Estimate (see Statistical Notes).

a In order to reduce distortions in grouped data trends caused by data gaps for individual countries and years (shown as "NAs"), the totals for the world, regions, and organizations include rough approximations for the gaps.

b Estimated by adding arms imports to data on military expenditures, which are believed to exclude arms purchases. However, it should be noted that the value of arms deliveries in a given year, as shown in Table II (converted at current exchange rates), may differ significantly from actual expenditures on arms imports in that year.

c This ratio is calculated from the dollar values in previous columns. In most cases it also is equal to the ratio that could be calculated from national currency values, since both numerator and denominator are usually converted into dollars by the same exchange rate or other conversion factor. In the case of this country, however, the two variables are converted at differing rates, yielding a different ratio than would obtain in national currency. The ratio for Russia in rubles terms, for examble, is believed to be less than 10 percent in 1994. See Statistical Notes, Military Expenditures-to-GNP Ratio for further discussion.

d This series or entry probably omits a major share of total military expenditures, probably including most expenditures on arms procurement. Table II shows estimated annual arms imports; It should be kept in mind, however, that data in Table II represent the estimated value of arms delivered in a given year, not actual expenditures on those arms.

e Unified Germany as of 1991 is shown under West Germany; data for East Germany end in 1990.

f Some part of estimated total military expenditures may not be included in announced central budget expenditures. The ratio of ME to CGE therefore may be somewhat overstated.

g Unified Yemen as of 1990 is shown under Yemen (Sanaa); data for Yemen (Aden) end in 1989.