cali property taxes and the schools

i present Exhibit 1 for those of you gentle readers who may reside in the state of california. i've heard a lot of noise about how the schools are underfunded in this state because property taxes were held down by prop. 13. you will note that in the last 26 years, cali's property taxes have been on par with other states, with an explanation of how that has happened. so, why are our schools in such a mess?