Population · Age The chart below shows the percentage of total US population aged 65 and over between 1900 and 2000. Water The table below describes water usage for 3 different purposes in 6 countries in 2003. Energy The pie charts below compare the proportion of energy capacity in gigawatts (GW) in 2015 with the predictions for 2040. Spending The pie charts below show the average household expenditures in a country in 1950 and 2010. Transport · Employment The graph below shows the average number of UK commuters travelling each day by car, bus or train between 1970 and 2030. Universities · Education The pie charts below illustrate the number of journal articles read per week by all students, PhD students, and junior lecturers at an Australian university. Transport · Trade The graph shows the quantities of goods transported in the UK between 1974 and 2002 by four different modes of transport. Communication The chart below shows the total number of minutes (in millions) of telephone calls in Finland, divided into three categories, from 1995 – 2004. Transport · Construction The plans below show the site of an airport now and how it will look after redevelopment next year.