Section 222.51 - National Forests in 16 Western States(a) Grazing fees are established on lands designated National Forests and Land Utilization Projects in the 16 contiguous Western States of Arizona, California, Colorado, Idaho, Kansas, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Utah, Washington, and Wyoming. (National Grasslands are excluded, see § 222.52 .)(b) Notwithstanding the provisions of § 222.50 , paragraph (b), the calculated grazing fee for 1988 and subsequent grazing fee years represents the economic value of the use of the land to the user and is the product of multiplying the base fair market value of $1.23 by the result of the annual Forage Value Index, added to the sum of the Beef Cattle Price Index minus the Prices Paid Index and divided by 100; provided, that the annual increase or decrease in such fee for any given year shall be limited to not more than plus or minus 25 percent of the previous year's fee, and provided further, that the fee shall not be less than $1.35 per head per month. The indexes used in this formula are as follows: (1) Forage Value Index means the weighted average estimate of the annual rental charge per head per month for pasturing cattle on private rangelands in the 11 Western States (Arizona, California, Colorado, Idaho, Montana, New Mexico, Nevada, Oregon, Utah, Washington, and Wyoming) (computed by the National Agricultural Statistics Service) from the June Enumerative Survey) divided by $3.65 per head month and multiplied by 100;(2) Beef Cattle Price Index means the weighted average annual selling price for beef cattle (excluding calves) in the 11 Western States (Arizona, California, Colorado, Idaho, Montana, New Mexico, Nevada, Oregon, Utah, Washington, and Wyoming) (computed by the National Agricultural Statistics Service) for November through October (computed by the National Agricultural Statistics Service) divided by $22.04 per hundred weight and multiplied by 100; and(3) Prices Paid Index means the following selected components from the National Agricultural Statistics Service "Annual National Index of Prices Paid by Farmers for Goods and Services" adjusted by the weights indicated in parentheses to reflect livestock production costs in the Western States:1. Fuels and Energy (14.5);2. Farm and Motor Supplies (12.0);3. Autos and Trucks (4.5);4. Tractors and Self-Propelled Machinery (4.5);5. Other Machinery (12.0);6. Building and Fencing Materials (14.5);8. Farm Wage Rates (14.0);44 FR 24843, Apr. 27, 1979, as amended at 53 FR 2984, Feb. 2, 1988