The question implies a ratio between sheep and human population. While it's difficult to pinpoint a country with exactly seven times more sheep than people at any given moment (populations fluctuate), New Zealand is consistently known for having a significantly higher sheep-to-human ratio than most other countries.
While it might not always be exactly 7:1, New Zealand's sheep population has historically been many times larger than its human population. It's a well-known fact and a significant aspect of the country's agricultural identity.
It is important to note that ratios change. The ratio in the past may have been closer to 7:1 than current numbers.