For years, Bible Gateway hosted the 1984 NIV. In 2016, they switched all free access to the 2011 NIV. However, if you own a paid subscription to certain Bible software (like Logos or Accordance), you can often still access the 1984 text via their web apps.
31 God saw all that he had made, and it was very good. And there was evening, and there was morning—the sixth day. niv 1984 bible pdf