The graph illustrates the quantity of individuals participating in a wildlife survey in Britain from 2001 to 2009.
Overall, the number of adults joining a wildlife survey is almost higher than that of children in all the period. In addition, there was an increase in the figures for 2 categories.
The number of participants who were children started the period with 12000, followed by a climb to 32000 after 4 years before ending the period with 540000.
The sum people who took part in a wildlife survey was as four times as that of children in 2001, then it went up to 364000, followed by a decline to 362000 before surging to 540000.
The quantity of participating adult was 36 million in 2001. The year 2005 witnessed an increase of 296 million in the figure for this category. Accordingly, it gradually decreased to 270000 in the end of the period.
