Bluebulb Projects' The Measure of Things presents:
13,000 is about one-six-thousand-five-hundredth the number of Copies of Wii Sports Sold.
In other words, it's 0.0001572 times the count of Copies of Wii Sports Sold, and the count of Copies of Wii Sports Sold is 6,361 times that amount.
(a.k.a. Wii スポーツ, a.k.a. Wi Supotsu
) (2006 edition) (sales figures as of March 31, 2015)