15. What happened to global airtransportation from 1950 to 1998?

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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.

YearPeopleFreightYearPeopleFreightYearPeopleFreight
1950280.7197569719.419871,58948.3
1955611.2197676421.519881,70553.3
19601092.0197781823.619891,77457.1
19662295.7197893625.919901,89458.8
19672736.519791,06028.019911,84558.6
19683098.219801,08929.419921,92962.6
19693519.819811,11930.919931,94968.4
197046012.019821,14231.519942,10077.2
197149413.219831,19035.119952,24883.1
197256015.019841,27839.719962,42689.2
197361817.519851,36739.819972,57099.8
197465619.019861,45243.219982,62199.0

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


Source: Vital Signs 1999, Worldwatch Institute

http://www.globalpolicy.org