In February of 2000 the NASDAQ Composite index peaked at a level of 4,698 (just before the Tech Bubble popped). In February of 2006 it was at a level of 2,012. The NASDAQ index has historically grown at an average annual rate of 9.5%. If the index continues to grow at its historic rate, then how many years will it take for the index to grow from its Feb 2006 level back to the Feb 2000 level? How many years will it take for the index to grow from its Feb 2006 level back to the Feb 2000 level? years (Round to the nearest whole number.)