I did this exact thing last week (I think it was my financial win for the week?) But YNAB calculates my net worth for me so I just exported that data since I started using the program and put it into my own spreadsheet. Even made a line graph to mark my progress.
Did the same thing for my salary too, since I have the data for all my raises and such from my first company. The one thing missing is the *actual* money earned every year, because unless the raise kicked in on January 1, there were years where my earnings were a split between two different salaries.