View source for 15. What happened to global airtransportation from 1950 to 1998?

From 1950 to 1998, more and more people use airplane to travel around the world which can decrease the time spending on a certain journey, and the figures in the below table give a detailed description.

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<table border=2 cellpadding=4 cellspacing=2>  
<tr><th>Year</th><th>People</th><th>Freight</th><th>Year</th><th>People</th><th>Freight</th><th>Year</th><th>People</th><th>Freight</th><tr>

<tr><th>1950</th><td align=right>28</td><td align=right>0.7</td><th>1975</th><td align=right>697</td><td align=right>19.4</td><th>1987</th><td align=right>1,589</td><td align=right>48.3</td></tr>

<tr><th>1955</th><td align=right>61</td><td align=right>1.2</td><th>1976</th><td align=right>764</td><td align=right>21.5</td><th>1988</th><td align=right>1,705</td><td align=right>53.3</td></tr>

<tr><th>1960</th><td align=right>109</td><td align=right>2.0</td><th>1977</th><td align=right>818</td><td align=right>23.6</td><th>1989</th><td align=right>1,774</td><td align=right>57.1</td></tr>

<tr><th>1966</th><td align=right>229</td><td align=right>5.7</td><th>1978</th><td align=right>936</td><td align=right>25.9</td><th>1990</th><td align=right>1,894</td><td align=right>58.8</td></tr>

<tr><th>1967</th><td align=right>273</td><td align=right>6.5</td><th>1979</th><td align=right>1,060</td><td align=right>28.0</td><th>1991</th><td align=right>1,845</td><td align=right>58.6</td></tr>

<tr><th>1968</th><td align=right>309</td><td align=right>8.2</td><th>1980</th><td align=right>1,089</td><td align=right>29.4</td><th>1992</th><td align=right>1,929</td><td align=right>62.6</td></tr>

<tr><th>1969</th><td align=right>351</td><td align=right>9.8</td><th>1981</th><td align=right>1,119</td><td align=right>30.9</td><th>1993</th><td align=right>1,949</td><td align=right>68.4</td></tr>

<tr><th>1970</th><td align=right>460</td><td align=right>12.0</td><th>1982</th><td align=right>1,142</td><td align=right>31.5</td><th>1994</th><td align=right>2,100</td><td align=right>77.2</td></tr>

<tr><th>1971</th><td align=right>494</td><td align=right>13.2</td><th>1983</th><td align=right>1,190</td><td align=right>35.1</td><th>1995</th><td align=right>2,248</td><td align=right>83.1</td></tr>

<tr><th>1972</th><td align=right>560</td><td align=right>15.0</td><th>1984</th><td align=right>1,278</td><td align=right>39.7</td><th>1996</th><td align=right>2,426</td><td align=right>89.2</td></tr>

<tr><th>1973</th><td align=right>618</td><td align=right>17.5</td><th>1985</th><td align=right>1,367</td><td align=right>39.8</td><th>1997</th><td align=right>2,570</td><td align=right>99.8</td></tr>

<tr><th>1974</th><td align=right>656</td><td align=right>19.0</td><th>1986</th><td align=right>1,452</td><td align=right>43.2</td><th>1998</th><td align=right>2,621</td><td align=right>99.0</td></tr>

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People = Billion passenger kilometers . . . Freight = Billion ton kilometers

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<i>Source: Vital Signs 1999, Worldwatch Institute</i>

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