Style suggestion please or how to edit chicago full note

I have been using the Chicago Manual of Style (full-note) but I need to find an alternative or edit it because this style does not include the publication date (in the footnote) on subsequent citations of the same work. Would somebody be kind enough to indicate an alternative style that does this, or how to edit the appropriate part of Chicago?

As can be seen in the following example, the first citation (nm.1) for Obuchi contains the date of publication. However, in the second instance (nm.3), there is only the author's name (i.e. Obuchi) and the title of the work. I need subsequent entries to include the publication date too.

1. Keizo Obuchi, “Opening Remarks at An Intellectual Dialogue on Building Asia’s Tomorrow” (presented at the Intellectual Dialogue on Building Asia’s Tomorrow, Tokyo, 1998), http://www.mofa.go.jp/policy/culture/intellectual/asia9812.html.

2. Yukio Takasu, “Statement at Open Debate of the Security Council on Women and Peace and Security” (presented at the Open Debate of the Security Council on Women and Peace and Security, United Nations Security Council, October 23, 2007), http://www.mofa.go.jp/announce/speech/un2007/un0710-13.html.

3. Obuchi, “Opening Remarks at An Intellectual Dialogue on Building Asia’s Tomorrow.”

Please advise.
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