In a prior forum post the growth rate of a Jubaea Chilensis was discussed by many and is highly recommended.
https://www.palmtalk.org/forum/topic/19995-the-explosive-growth-ofjubaea-chilensis/?&page=4#comments
In 1989 I planted two Jubaea Chilensis that were 5 and 7 years old. The following 6 pictures and graph shows growth rate of one of those palms, with the first picture taken in 2006. I could not find earlier pictures between 1989 and 2006 as they are packed away someplace