The sales figures of a particular brand of sugar in 3 states over 3 years are given in the below table. The figures are in lakhs of rupees.
| State1 | State2 | State3 | |
| Year1 | 15 | 12 | 9 |
| Year2 | 12 | 14 | 8 |
| Year3 | 14 | 15 | 13 |
What is the percentage difference in sales from year 1 to year 3?