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TABLE2D Based Aircraft vs. Population Projections San Marcos San Marcos Aircraft per Year Based Aircraft Population 1,000 Population 1980 51 42,483 1.20 1992 86 29,720 2.89 1998 124 39,491 3.14 2000 227 42,500 5.34 Constant Share Projection 2005 243 45,439 5.34 2010 266 49,787 5.34 2020 348 65,172 5.34 Decreasing Share Projection 2005 241 45,439 5.3 2010 259 49,787 5.2 2020 319 65,172 4.9 As indicated in the table, San Marcos has experienced a general increase in based aircraft since 1980. Not shown on this table, however, is based aircraft in 1985 which was 100. This figure was not used due to lack of population information for the city of San Marcos for 1985. This indicates that the airport experienced a trend similar to the national trend. The early to mid 1980's witnessed a surge of aircraft ownership, while the late 1980's and early 1990's experienced a general decrease due to a slowing economy and aircraft liability law changes. In 1998, however, based aircraft climbed back to 124 which follows national trends of increased aircraft manufacturing and the steady increase in aircraft ownership. In 2000, based aircraft increased by 103, nearly doubling which can be directly related to the shift of Austin's airports and the closing of Austin Executive Airport. San Marcos Municipal based aircraft per 1,000 city of San Marcos residents has fluctuated between a low of 1.20 in 1980 to a high of 5.34 in 2000. This trend is very similar to that experienced at general aviation airports across the country as the economy and legislation suppressed aircraft ownership in the late 80's. However, the trend has since reversed itself as new legislation has opened the doors to aircraft production and the economy has been strong. Two forecasts were produced using the ratio of based aircraft per 1,000 city of San Marcos residents. First, a constant 2-14