The legislature finds that the property tax exemption authorized by Article VII, section 10 of the state Constitution should be made available on the basis of a retired person's ability to pay property taxes and that the best measure of a retired person's ability to pay taxes is that person's disposable income as defined in RCW
84.36.383. The legislature further finds that veterans with one hundred percent service-connected disabilities have given so much to our country that they deserve property tax relief.