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(as of June 30, 2018)
|Credit Rating Agency||Long-term Bond||Definition of ratings|
|Rating and Investment Information, Inc.||AA＋||Very high creditworthiness supported by some excellent factors|
|Moody's Investors Service||Aa3||Judged to be of high quality and are subject to very low credit risk|
|Standard & Poor's||AA－||Differs from the highest-rated obligations only to a small degree. Capacity to meet its financial commitment on the obligation is very strong.|