By what percent did the median annual cost of health insurance in City X increase from 1990 to 2000?
1. In 1990, the median annual cost of health insurance in City X was$$\frac{2}{3}$$ of the median annual cost of health insurance in City Y.
2. In 2000, the median annual cost of health insurance in City X was$$\frac{6}{7}$$ of the median annual cost of health insurance in City Y.