21. "The replacement rate " of Unix-based systems, he said, " will go to four-to-one or better ." 22. Or consider North America, where the replacement rate hovers around 100 percent, depending on where you look. 23. To maintain a stable population size, the necessary replacement rate is 2 . 1 children per couple. 24. The production capability of the Soviets is reflected in the replacement rate , which rises during the game. 25. But when the projected value of 401 ( k ) plan accumulations is considered, income replacement rates soar. 26. For example, the replacement rate in Missouri is 55.4 %, while in New York it is 77.1 %. 27. Since turtles are slow to sexually mature and are long-lived, they generally have poor replacement rates when hunted. 28. Replacement rate dropped below zero in the 1970s when the government was urging parents, " Stop at two ."29. They also modeled the painted turtles'replacement rate and suggested that unrestricted harvest put the populations in danger of dropping strongly. 30. The U . S . figure is barely 2.0, and it has been below the replacement rate for 30 years.
