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3 Indexes on a December 1996=100 base. <br />4 Indexes on a December 2017=100 base. <br />5 Indexes on a December 1986=100 base. <br />6 1998 - 2017 indexes based on substantially smaller sample. <br />7 Indexes on a December 2001=100 base. <br />8 Indexes on a 1987=100 base. <br />NOTE: Local area indexes are byproducts of the national CPI program. Each local index has a smaller sample size than the national index and is, <br />therefore, subject to substantially more sampling and other measurement error. As a result, local area indexes show greater volatility than the national <br />index, although their long-term trends are similar. Therefore, the Bureau of Labor Statistics strongly urges users to consider adopting the national <br />average CPI for use in their escalator clauses.