the graph shows sale revenue in Psi

the graph shows sale revenue in Psirayabag company over 4 years. the x-axis show the year and the y-axis represents the sale revenue per year. In 2010 , sale revenue in Psirayabag company has $1.0 million per years. In 2011, sale revenue bag's increased steadily to $3.0 million per years. the next year, sale revenue bag's decreased dramatically from $3.0 to $2.0 million per years. the following year, there was a slight drop in sale revenue psirayabag to $1.8 million per years.