Which year has the highest percent increase/decrease in exports as compared to the previous year?

As we see in the graph the Export graph is higher for 2003 to 2004 years. So we will calculate for this year.
Required percentage for 2004 = (Export in 2004 - Export in 2003) x 100/Export in 2004
Required percentage for 2004 = (600 - 200) x 100/200 = 200%