As used in RCW 40.14.010 and 40.14.100 through 40.14.180, unless the context requires otherwise, "legislative records" shall be defined as correspondence, amendments, reports, and minutes of meetings made by or submitted to legislative committees or subcommittees and transcripts or other records of hearings or supplementary written testimony or data thereof filed with committees or subcommittees in connection with the exercise of legislative or investigatory functions, but does not include the records of an official act of the legislature kept by the secretary of state, bills and their copies, published materials, digests, or multi-copied matter which are routinely retained and otherwise available at the state library or in a public repository, or reports or correspondence made or received by or in any way under the personal control of the individual members of the legislature.