Please see below a sample Academic IELTS Writing Task 1 essay....
The bar graph details the changes in travel habits by fives different modes of transport in both 1990 and 2000 in the UK. Looking from an overall perspective, it is readily apparent that the rise in total figures over the period was a result of increases from rail, bus, and air as bicycle and motorbike usage fell. The most common forms of travel were by far bus and rail.
Looking first of all at the two leaders, bus use accounted for precisely 40 kilometres in 1990, before a small increase of 5% to 42 by 2000. Rail was lower in both periods at 36 and 38 km, respectively. The lesser used modes of transport were all below 5km per week. Travel by bicycle started at 2 and halved to 1km while motorbikes also halved from 4 to 2km. Finally, air travel in 1990 was just above 1 but quadrupled to 4km per month per person by 2000.
Overall totals constituted 100km in 1990 and a subsequent increase of 10% to 110km by the end of the surveyed period.