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3.1.3 Household size <br />Table 13 (on page 60) shows historical trends in household size and <br />demographic changes that may affect future average household size. The <br />best available and most recent data for average household size is from the <br />2010 Decennial Census, which presents information about average <br />household size for all households in Eugene. While the 2011 American <br />Community Survey data about average household size is one year more <br />recent, it is based on a sample of households in Eugene. This analysis uses <br />the average household size from the 2010 Decennial Census (2.24 persons <br />per household), given the fact that the Decennial Census is a survey of all <br />households in Eugene. The analysis assumes that Eugene will have an <br />average household size of 2.24 persons per household for the 2012 to <br />2032 period. <br />3.1.4 Vacancy rate <br />Vacant units are the final variable in the basic housing need model. <br />Vacancy rates are cyclical and represent the lag between housing demand <br />and the market's response to that demand by producing additional <br />dwelling units. Vacancy rates for rental and multi -family units are <br />typically higher than those for owner -occupied and single-family dwelling <br />units. <br />Figure 4 shows that the average vacancy rate for all housing types Eugene <br />varies by time period. Eugene's recent vacancy rates were 5.0% in 2010 <br />and 6.0% in 2011. <br />Figure 4. Average vacancy rate, Eugene, 1990, 2000, 2010, and 2011 <br />7.0% <br />6.0% <br />5.0% <br />2.0% <br />1.0% <br />0.0% <br />5.4% <br />3.6% <br />5.0% <br />6.0% <br />1990 2000 2010 2011 <br />Source: U.S. Census 1990 SF1 H002, U.S. Census 2000 SF1 H3, American Community Survey 2011 625002 <br />Page 34 ECONorthwest Part 11 — Eugene Housing Needs Analysis <br />