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(18.6%) comb manu <br />(18.1%) govt Ind <br />elec pow <br />(6.9%) rec <br />s <br />(01 .3%) .5%1 pco ecl mbape p <br />(53.6%) other <br />llgure II-2-5. Personal Income Tax (1989) - Colorado River Basin <br />2. Historical Developments in the Colorado River Basin States <br />The most significant economic development affecting the endangered fishes has been the <br />rapid growth of population and urbanization since the turn of the century. In each of the <br />seven States there has been a steady increase in the level of urbanization since 1950 (see <br />Table 11-2-2). This growth has been marked in the case of New Mexico, Colorado, Utah, <br />and Arizona. The fraction of the population of New Mexico living in urban areas in 1950 <br />was 50.2 percent. By 1990, this had increased to 73.0 percent. In Colorado the increase <br />was from 62.7 percent in 1950 to 82.4 percent in 1990. Similar patterns are observed for <br />Arizona and Utah. This population growth and shift has led to increased demands for water <br />and for electric power. Municipal and industrial uses of water have increased since 1950. <br />3. The Colorado River Basin States Economy Relative to the National Economy <br />The Colorado River Basin region constitutes a considerable fraction of the U.S. economy. In <br />1989, the total employment in the Basin represented approximately 18 percent of the total <br />II-2-15