The given line graph illustrates the quantities of visitors visiting Blue Mountain National Park, measured in thousand, in the 11-year period from 2005 to 2015.
In general, the trend shows an increase in visitor numbers throughout the period, despite a significant drop in 2010 before recovering back to the highest in the last year.
In 2005, the park attracted only around 150,000 visitors, which was the lowest. Over the next 3 years, this figure consistently increased to 200,000. It was probably that because of the improvements in facilities and activities. However, there was a noticeably dip in 2010, when they experienced a decline to 180,000 visitors, perhaps, owing to the conditions of climate or economic constraints.
Nevertheless, from 2011 and upwards, the numbers gradually climbed up again, with a clear increase to nearly 190,000 and 210,000 visitors in 2011 and 2012, respectively. This steady rise led to its peak at about 250,000 in 2015.